Things I try to do (that can be hard) are to...
Try to eat omega 3s and eat fresh fruits and veggies.
Get at least 15 minutes of sunlight
Meditate
Focus on the moment, I might have to do something awful in an hour, but maybe in this moment I can just sit here and be safe.
Know my support network and access them when I can. I try to keep a running list in my head of people I can go to for support such as friends, family, online resources. I try not to burden one source too much so they don't burn out.
Listen to music.
Keep a regular sleep schedule
Go out into nature
Interact with animals

That's all I can think of right now.