Meditation can help. Therapy can help. Doing something engaging to distract yourself can help (ideally something that isn’t gonna make you feel worse in the end, playing with a pet or listening to music > binging on junk food or booze)
Remember that you can’t control whether crappy things happen but you choose how you react to them. (Of course, easier said than done)
As someone with ADHD I hear you but FML is the meditation angle such contrived bullshit. Like biiiiiitch I can't go 1 minute without moving or mind racing or anything else.
Now for people with ADHD like me. What I found helps me is running. Running is the only time I am at peace. All my senses are being activated at once and therefore I'm at my calmest.
Edit - also want to add that running is solitary. So I also get to say "fuck off" to the rest of the world.
This may seem like a "generic answer"... but "be happy of what you already are right now" does wonders. Because that happens when your need of self-validation is "hurted" by that bad situation you went through.
I'm not a hippy freak. I have a mood disorder and struggle with intense emotions. Meditation will knock that shit out of your mind so fast your head will spin.
When my wife and I did our government paperwork for or marriage, the parking meter ate one of our coins, and we missed the time by like 2 minutes and ran outside to see someone writing us a ticket.
So now she remembers the day we got married as the day we got a parking ticket.
It wasn't even the day of our wedding. That was a different day. We did the paperwork ahead of time to get it out of the way. We just did the paperwork that day, and it's all she remembers.