Full time worker here as eCOmmerce Manager, also got a company on my own on the other hand and are workin on the EC forums :D
Currently got to a point where i only have about 6 hours a day for my own ( sleep excluded ). Whenever i finish my work at a certain location, lets say at my full time job
I get to my car and drive arround for like an hours, speeding a little bit and calm down doing this. That helped me in the last 3 years drasticly.
TL;DR
Find something that calms you down, something you enjoy while not eating to much time while doing it. Go to the gym for example ( after covid lockdown ofc ).
Get yourself a nice car and drive arround with it. SImply do anything that calms you down for something like an hour, forget everything while doing it and concentrate
on the pure joy of your activity.
Edit:
Mental health isnt a joke - take is seriously.