I spent weeks after D-Day convinced there was something fundamentally wrong with me.
Not with my marriage — I knew what was wrong with that. With me. With my body and my brain. I couldn’t understand why I could go from screaming rage to complete numbness in the span of twenty minutes. Why I could be hypervigilant at 2 AM and unable to move at 2 PM. Why my body seemed to have a mind of its own, lurching between extremes that made no sense.
Then someone explained the nervous system to me. Not in clinical jargon. Not in a textbook. In plain language that made everything click.
And the moment it clicked — the moment I understood that my body was running a program, not a personality flaw — something shifted. I couldn’t control the program yet. But I could finally stop blaming myself for it.
This article is that explanation.
Your Nervous System in Three States
The autonomic nervous system — the system that controls all the things you don’t consciously think about, like heart rate, breathing, digestion, and the fight-or-flight response — operates in three basic states. Polyvagal theory, developed by neuroscientist Stephen Porges, maps these states and explains how they interact.
You don’t need to memorize any of this. You just need to recognize where you are.
The Ventral Vagal State: Where You Used to Live
This is the state of safety, connection, and engagement. When your nervous system is in the ventral vagal state, you can be present. You can think clearly. You can feel joy, curiosity, and connection to others. Your heart rate is steady, your breathing is easy, and your prefrontal cortex — the rational, decision-making part of your brain — is fully online.
This is where you lived before D-Day. When you laughed at dinner. When you planned vacations. When you lay next to him and felt safe.
The goal of nervous system recovery is not to “get over” the affair. It’s to return to this state — not naively, not by pretending the betrayal didn’t happen, but by rebuilding your nervous system’s capacity to feel safe in your own body, even though the world has proven itself unsafe.
The Sympathetic State: The Alarm That Won’t Stop
When your nervous system detects a threat — any threat — it shifts from ventral vagal into the sympathetic state. This is the “fight or flight” mode.
Your heart rate increases. Cortisol and adrenaline flood your system. Your muscles tense. Your breathing becomes shallow and rapid. Your attention narrows to the threat. Your rational brain takes a backseat so your survival brain can drive.
In a healthy system, this is temporary. The threat passes, the alarm shuts off, and you return to the ventral vagal state.
After D-Day, the alarm doesn’t shut off. Because the threat isn’t a bear or a fire — it’s the person sleeping next to you. It’s in your home. It’s in your phone. It’s in every memory that’s now being reprocessed through the lens of betrayal.
This is why you can’t stop checking his phone. Why you’re scanning his face for micro-expressions. Why your body feels like it’s vibrating with electricity. Why you want to scream, fight, run. Your sympathetic nervous system is on, and it doesn’t know how to turn off, because the source of danger is embedded in the fabric of your daily life.
The Dorsal Vagal State: The Shutdown
When the sympathetic system has been running so long that your body becomes exhausted — when the alarm has been ringing for so long that your nervous system can’t sustain the effort — it collapses into the third state: dorsal vagal.
This is the “freeze” or “shutdown” response. Think of the turtle retreating into its shell. Your body conserves energy. You feel numb. Flat. Disconnected from your own life, as if you’re watching it happen to someone else. You can sleep for twelve hours and still feel exhausted. You can’t cry, can’t feel, can’t care.
Some women describe this as depersonalization — the sensation of being removed from your own body, like watching your life through a window. Others describe it as depression. The clinical reality is that it’s a survival mechanism — your nervous system, overwhelmed beyond capacity, shutting down to protect you from a level of distress it can’t process.
Why You Swing Between Them
Here’s the piece that made everything make sense for me.
You’re not in one state. You swing between them — sometimes within minutes. Hypervigilant and shaking at 2 AM (sympathetic). Numb and unable to get off the couch at noon (dorsal vagal). Briefly okay during a conversation with a friend (ventral vagal). Then a trigger hits — a word, a song, a notification — and you’re back in fight-or-flight before you’ve finished your sentence.
This is not instability. This is not “being dramatic.” This is a nervous system that has lost its ability to regulate. The transitions between states are happening automatically, involuntarily, and with very little provocation — because the baseline has shifted from “safe” to “threatened.”
Understanding this changes everything. Because it means that what you’re experiencing is not a character flaw. It’s a nervous system state. And states can be changed — with practice, with the right tools, with time.
The Window of Tolerance — And Why Yours Has Shrunk
There’s a concept in trauma therapy called the “window of tolerance.“ It describes the zone of nervous system activation in which you can function — feel emotions, think clearly, handle stress — without tipping into hyperarousal (panic, rage, obsessive thought) or hypoarousal (numbness, shutdown, dissociation).
Before D-Day, your window was probably wide. You could handle a stressful day at work, a fight with a friend, a sleepless night, and bounce back.
After D-Day, that window has narrowed to almost nothing. A notification sound can tip you into panic. A quiet evening can drop you into numbness. You have almost no buffer between “okay“ and “not okay.“
This is normal after trauma. And the goal of every somatic exercise — every breathing technique, every grounding practice, every vagus nerve exercise — is to widen that window. Not to eliminate the pain. Not to make you “fine.“ Just to give you a little more space between the trigger and the reaction.
A slightly wider window means you can catch yourself before the panic takes over. It means you can feel a wave of grief without drowning. It means you have room to think before you react.
That room is everything.
Your Amygdala and the $500 Reaction
A trauma therapist once described it this way: if someone has a five-hundred-dollar reaction to a fifty-cent problem, they’re not overreacting — they’re experiencing now and something old.
After betrayal, the traumatic memory of the affair is sitting in your amygdala — unprocessed, unresolved, and constantly being reactivated by anything that resembles the original threat. A text notification. The smell of a certain cologne. A Thursday evening, because Thursday was the night he “worked late.“
So when you snap at your child over something minor, or dissolve into tears over a TV commercial, or feel rage surge through you because he loaded the dishwasher wrong — you are not having a five-hundred-dollar reaction to a fifty-cent problem. You are having a fifty-cent reaction plus the full weight of the unprocessed trauma being triggered simultaneously.
This is not weakness. This is neuroscience.
How the Vagus Nerve Connects It All
The vagus nerve is the physical conduit between these nervous system states. It’s the communication line between your brain and your body, and its health — its “tone“ — determines how easily you can move from a stressed state back to a safe one.
After chronic betrayal trauma, vagal tone drops. The nerve that’s supposed to help you self-regulate has been weakened by months of sustained crisis. Rebuilding vagal tone — through breathwork, humming, cold exposure, and the other exercises outlined in Vagus Nerve Exercises for Betrayal Trauma Survivors — is one of the most impactful things you can do for your recovery.
What This Means for Your Recovery
Understanding your nervous system does not, by itself, heal you. But it does something almost as important: it removes the shame.
Because once you understand that the racing heart is sympathetic activation and not weakness, that the numbness is dorsal vagal shutdown and not apathy, that the swinging between extremes is a dysregulated nervous system and not a character flaw — you can stop fighting yourself and start working with your body.
Recovery from betrayal trauma is, at its core, a process of teaching your nervous system that safety is possible again. Not that the world is safe — it proved itself otherwise. But that you are safe. That your body can hold pain without breaking. That the alarm can ring and you can acknowledge it without being destroyed.
This is the journey from surviving to healing. And it starts with knowing what’s happening inside you.
Naming It Is the First Step
Here is what I want you to take away from this article.
The next time you feel the panic rising, try this: name the state. Say to yourself, “This is my sympathetic nervous system activating. This is fight-or-flight. This is my body trying to protect me.“
The next time you feel the numbness descending: “This is dorsal vagal. This is my body shutting down because it’s overwhelmed.“
Naming the state doesn’t stop it. But it puts a sliver of space between you and the experience. It gives you back a fragment of your prefrontal cortex — the part that says: I am not this state. This state is happening to me, and it will pass.
That fragment of awareness is the foundation of everything else. The breathing exercises, the vagus nerve work, the grounding techniques — they all start here. With knowing what’s happening. With naming it without shame. With trusting that your body, even in crisis, is trying its very best to keep you alive.
It is. And so are you.
For the complete somatic healing roadmap, return to the Hub Article: Why Betrayal Trauma Lives in Your Body — And How to Start Releasing It.
Take the Situation Assessment to get your Personalized Recovery Roadmap.
Get My Personalized Recovery Roadmap →
