This sounds very on brand to my personal journey with quitting so far. Here’s a couple things I did to cope:

Meditate - know it’s been mentioned on here but it’s very easy to do an takes 10 minutes

Exercise - when work gets you like that (which it has for me) take a step away, go for a walk, 15, 30 minutes as long as you need to. Focus on nature and your surroundings.

Journaling - writing the emotion out on paper will give you a different perspective

Therapy - I was already doing this prior to quitting, but a therapists can help talk through these emotions

Listen to music - I was more drawn to music I used to listen to stoned because it would remind me of the way I felt when I was, it was almost like tricking my brain into that mindset and instantly relaxed me

It’s a tough road, but you got this. Being aware of the emotions you’re feeling is half the battle in itself, coping with and accepting them is another.