Three weeks after D-Day, I was standing in my kitchen at 2 AM, unable to sleep, hands shaking, chest tight, heart pounding so hard I was genuinely afraid something was wrong with me.
I didn’t know it then, but what was wrong wasn’t my heart. It was my vagus nerve. Or more precisely — it was the fact that my vagus nerve had been effectively shut down by weeks of unrelenting stress, and my body had lost its ability to calm itself.
When I finally learned how to work with this nerve — this single, extraordinary nerve that runs from the brain to the gut — everything started to shift. Not all at once. Not dramatically. But perceptibly. The shaking eased. The chest tightness loosened. I could take a full breath for the first time in weeks.
These exercises are what I wish someone had handed me that night in the kitchen.
What the Vagus Nerve Actually Is
The vagus nerve is the longest nerve in your body. It starts at the base of your brainstem and winds downward through your neck, past your heart, through your lungs, and into your abdomen. “Vagus” comes from the Latin word for “wanderer” — because this nerve wanders everywhere.
Its primary job is regulation. When the vagus nerve is active and healthy — what researchers call “high vagal tone” — it tells your heart to slow down, your digestion to function, your muscles to relax, and your brain to shift out of emergency mode. It’s the bridge between the alarm system that’s been running nonstop since D-Day and the calm you desperately need.
Think of it as the “off switch” for the panic. Right now, that switch is stuck. These exercises are how you un-stick it.
For the full picture of what’s happening in your nervous system, read Betrayal Trauma and the Nervous System — A Guide for Non-Clinical Readers.
Why Betrayal Trauma Disrupts It
Here’s the short version: when your body enters sustained fight-or-flight mode — which is exactly what happens after discovering a partner’s affair — the sympathetic nervous system takes over and the vagus nerve gets suppressed. Your body prioritizes the alarm over the calm.
Over weeks and months of chronic stress — the trickle truth, the hypervigilance, the intrusive thoughts, the sleeplessness — the vagus nerve loses its tone. Like a muscle that hasn’t been used, it weakens. And without vagal activity, your body cannot self-regulate.
The good news: vagal tone can be rebuilt. Deliberately. Physically. Starting now.
Exercise 1: The Extended Exhale
This is the simplest and most accessible vagus nerve tool in existence. You can do it anywhere — in bed, in your car, in a meeting at work.
How: Breathe in slowly through your nose for four counts. Breathe out slowly through your mouth for six to eight counts. The exhale must be longer than the inhale.
Why it works: Inhalation activates the sympathetic nervous system (the accelerator). Exhalation activates the parasympathetic nervous system via the vagus nerve (the brake). By making the exhale longer, you’re essentially pressing the brake harder than the accelerator.
When: Anytime your heart rate spikes, anytime you feel the buzzing start, anytime you’re lying in bed with your thoughts racing. Five breaths is often enough to produce a noticeable shift.
Research shows that breathing at a rate of approximately six breaths per minute — five seconds in, five seconds out — is the optimal frequency for maximizing heart rate variability, which is the gold standard measure of nervous system health. This pattern has been shown to be more effective than popular alternatives like box breathing or the 4-7-8 technique.
Exercise 2: Voo Sounding
This one feels strange the first time you do it. Do it anyway.
How: Take a deep breath in. On the exhale, make a long, low “vooooo” sound — as deep in pitch as you comfortably can. Feel the vibration in your chest and abdomen. Repeat five to ten times.
Why it works: The vagus nerve passes directly through the vocal cords and the chest cavity. The vibration from the low-pitched sound physically stimulates the nerve along its path. This is also why humming, chanting, and even gargling can activate the vagal response.
When: When you’re in a private space and the chest tightness is acute. Many women find this particularly effective right before bed.
Exercise 3: The Mammalian Dive Reflex
This is the emergency tool. Use it when you’re in acute panic — when the chest pain is searing, when you can’t stop shaking, when the emotional flooding feels like it’s going to swallow you.
How: Fill a bowl with ice-cold water and submerge your face for fifteen to thirty seconds. Or hold a cold pack to your face and chest. Or splash ice-cold water on your face repeatedly.
Why it works: The trigeminal nerve on your face detects the sudden cold and sends a signal directly to the vagus nerve to slow your heart rate and initiate a calming response. It’s an automatic physiological reflex — you don’t have to “try” to calm down. Your body does it involuntarily.
When: Acute panic. Severe emotional flooding. The moment when you feel like you’re going to come apart. This is your circuit breaker.
Exercise 4: The Butterfly Hug
How: Cross your arms over your chest so that each hand rests on the opposite shoulder. Tap your shoulders in a slow, alternating rhythm — left, right, left, right — for one to two minutes. Keep your breathing slow and steady.
Why it works: This provides bilateral stimulation — alternating input to both sides of the body — which engages both hemispheres of the brain. It simultaneously activates the vagus nerve through gentle self-touch and has been shown to reduce activity in the amygdala, the brain’s alarm center.
When: When intrusive thoughts or “mind movies“ are cycling. When you need to self-soothe and there’s no one to hold you. When you’re trying to calm down before sleep.
Exercise 5: Humming and Chanting
How: Hum a single low note for the length of your exhale. Or repeat a simple sound — “om“ works, but so does any sustained, vibrating tone. Do this for two to five minutes.
Why it works: The same mechanism as voo sounding — the vibration travels along the vagus nerve pathway. Humming has the added benefit of being something you can do in public without drawing attention. You can hum in the car. You can hum while making dinner. You can hum while putting the kids to bed.
When: As a daily maintenance practice. Hum in the car on the way to work. Hum before a difficult conversation. Hum when the quiet moments get too loud.
Exercise 6: Gentle Neck Stretches
How: Slowly tilt your right ear toward your right shoulder. Hold for thirty seconds. Slowly tilt left. Then turn your head gently to the right, looking over your shoulder, and hold. Repeat left. Do this with slow, deliberate breathing.
Why it works: The vagus nerve runs through the neck. When your neck muscles are chronically tense — which they are in betrayal trauma, because “muscle armoring“ is a literal physical bracing for impact — they can compress the vagus nerve and reduce its function. Gentle stretching releases that compression.
When: Morning and evening. After long periods of sitting. Whenever you notice you’re clenching your jaw or hunching your shoulders.
When to Use These Exercises
You don’t need to do all six every day. Here’s a simple guide:
In acute crisis (panic, flooding, chest pain): The mammalian dive reflex first. Then extended exhale breathing until your heart rate drops.
For daily regulation: The extended exhale and humming, built into your morning or evening routine. Five minutes is enough to produce a measurable shift.
For sleep: Voo sounding and the butterfly hug, in bed, with the lights off. These are your nighttime settling tools.
For intrusive thoughts: The butterfly hug combined with slow breathing. The bilateral stimulation helps interrupt the thought loop while the breathing calms the body. For more on this, read Grounding Techniques for Intrusive Thoughts About the Affair.
Building a Daily Vagal Practice
I know the idea of “a daily practice“ feels absurd when you’re barely surviving. I’m not asking you to add an hour of wellness rituals to a day you’re already white-knuckling through.
I’m asking for five minutes. In bed, before you get up. Or in the car, before you go inside. Or in the shower, where no one can hear you hum.
Five minutes of extended-exhale breathing or humming, every day, can begin to rebuild the vagal tone that trauma stripped away. Not overnight. But over weeks, the shifts accumulate. The chest loosens. The sleep comes slightly easier. The baseline drops from “constant emergency“ to “manageable.“
That shift is not small. That shift is everything.
Your body has been screaming for weeks or months. These exercises are how you start whispering back: I hear you. You can rest now. We’re going to be okay.
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