Divorce, Grief, and the Overthinking Loop: How to Calm Your Brain After 'Life Theft’
Have you ever caught yourself replaying the same conversation with your ex, or reliving the moment you got the call that someone you love was gone?
For years after my mother's sudden death, I couldn’t stop thinking about what happened. I’d go over it again and again. If you’re grieving a divorce, it might be the moment your ex said, “I want a divorce,” or the moment you said it. You analyze what went wrong, revisiting every scene like a movie stuck on repeat.
You want to move forward. You want to stop thinking about it. But your brain seems stuck in a loop, replaying the highlight reel, the regrets, and the what-ifs.
If this sounds like you, you're not alone. And more importantly: you're not broken. This is how the grieving brain works.
This Is Grief… and This Is the Brain
As a thanatologist, someone trained in the study of death, loss, and grief, I’ve spent years supporting people through all kinds of endings: deaths, divorces, estrangements, and identity shifts. And I’ve experienced these losses myself.
Grief isn’t just emotional. It’s physical. It lives in the body and the brain.
Thanks to recent neuroscience research, we now understand more about why grief feels so overwhelming and why it can take longer to process than we expect, especially after something as life-altering as a death or divorce.
How Grief Affects Your Brain: Understanding the Default Mode Network
There’s a part of your brain called the Default Mode Network (DMN). You don’t need to remember the name, but you’ll recognize what it does: it’s most active when you're not focused on anything external when you're resting, reflecting, or daydreaming.
It’s what kicks in when you're lying in bed and suddenly start thinking about your old life, your ex-partner, or the moment everything changed.
For me, it usually happens in the early mornings. That’s when my mind goes back to the abuse, why I stayed too long, or how I didn’t see it sooner.
During grief, this network becomes overactive, pulling you into mental loops of:
Rumination
Regret
Self-blame
Fantasies of reunion or "what could have been”
Your brain isn’t doing this to punish you. It’s trying to help you make sense of your loss. It’s searching for meaning, trying to piece together a story your heart hasn’t yet caught up to.
What Science Says
Dr. Mary-Frances O’Connor, a neuroscientist and grief researcher, has studied this phenomenon in depth. Her brain imaging research shows that in both bereavement and complicated grief, the Default Mode Network lights up intensely when people are reminded of their loss.
This is your brain learning the new reality, that someone is gone, or that a relationship is no longer safe, present, or available.
When Divorce is an Ongoing Battle
If your divorce is antagonistic or involves narcissist abuse, what I often call "life theft", your brain is carrying a double load. You aren't just mapping an absence (the loss of the relationship); your brain is also trying to map a threat.
In these cases, your amygdala, the brain’s alarm system, stays on high alert. This makes it even harder for the Default Mode Network to settle down. You aren’t just ruminating on the past; your brain is frantically trying to predict the next conflict to keep you safe. Recognizing that you are dealing with both grief and a prolonged stress response can help you be even more patient with your pace of healing.
Why Grief (Especially After Divorce) Takes So Long
If you’ve ever asked, “Why can’t I just move on?” this is part of the answer.
Your brain isn’t just dealing with memories. It’s rewiring your internal map. It’s trying to adjust to a world where someone important is no longer reachable, even if the loss wasn’t sudden.
I remember going to the grocery store a few months after my separation and, without thinking, putting items in the cart that my ex would have wanted. I stood in the checkout lane and thought, “Why am I buying this?”
And more than a year after my mom died, I had a moment where I instinctively reached for my phone to call her. It was surreal. My heart knew she was gone, but my brain hadn’t fully caught up.
Grief isn’t just emotional. It’s neurological work.
How to Calm the Overthinking Loop
You don’t need to fight your brain. But you can support it gently. These simple practices can help settle the Default Mode Network and ease the constant overthinking:
Journal
Let the thoughts out of your head and onto paper. It gives your brain somewhere else to “put” them. I often recommend this to clients going through either divorce or death loss. Narrative therapy, writing to process, can be a powerful tool. For myself I wrote for 30 days 3 pages a night. I hated doing it and thought this is so stupid. But what came out was so much it was mostly not readable and it was never going to be shared with anyone.
Breathe
Even a few minutes a day can give your brain relief from overprocessing. I like the 4-7-8 breath to calm the nervous system and slow the mind. The breath has to expand your diaphragm and make sure your breath out is longer than your breath in.
Move or Get Into Nature
Walking in quiet places soothes both emotional and neurological systems. You can also check out my blog on Forest Bathing, which can be incredibly helpful during grief. You can read more about this in my blog, Forest Bathing for Grief and Divorce Recovery: How Nature Helps You Heal
Tell Your Story
Talking with someone who can hold space, a therapist, grief coach, or support group, helps your brain integrate the loss, rather than just circling it. Writing Your Divorce Story: Why It's Crucial for Healing and Growth
You’re Not Broken. You’re Grieving.
If your brain feels foggy, emotional, or stuck in reverse, this is normal. This is how the brain adapts to life-altering changes. And it won’t always feel like this.
With support and the right tools, the loops start to slow. The fog lifts. And your brain begins to see a life on the other side of this pain. When that happens, it doesn’t mean the grief is gone.
It means your brain has finally learned how to live with it.
Take the Next Step with Confidence
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