How do you guys cope with major stress?

I’m going to link this and give an update.
This user is me, posted from an alt account because I wasn’t comfortable at the time posting from this account.
Since then, I have been out of that relationship for exactly 8 months. I have taken legal action but I won’t be anymore specific than that at this time.
I am not currently in therapy, to be honest I dislike 1 on 1 and never could quite talk about what I was paying to talk about. Always discussed this that and the other thing (mainly college)
I was doing well for a few months, mainly because I never heard from police and just assumed that maybe I was over-reacting and things weren’t as bad as they actually were. Now that things are happening and I’m hearing all these terms being used I realize he truly was dangerous and it’s scaring me quite a bit.
I’ve been having nightmares, losing sleep, getting hives (rashes) from stress and just overall constantly anxious.
I’m mainly looking for some tips on how you guys deal with stress, I guess. Things aren’t looking to bright in my eyes anymore.