Well there are a lot of things I do to manage my stress when it gets to be bad.
1. I wake up really early in the morning at like, around 4 and I leave the house wearing pretty light clothes (jeans and a sweat shirt). I take a long walk to the nearest park or anywhere with lots of trees and grass. Then I lay down and look up at the stars and watch the sky. When I am done (when the sun starts to just rise) I get up and jog in the fresh morning air.
2. I turn off all the light in my room and light incense and meditate for as long as my schedule allows.
3. Finding a distraction is good also, for me its reading (do something you like a lot that calms you down).
Also for me herbal tea helps, I like to make valerian root (tastes terrible but actually helps) or lemon balm tea. Also pick up some St. Johns Wort if you can, it helps me with anxiety a lot. There are lots of other herbs that can help you with stress and anxiety, just seek them out. Anyway best of luck with feeling better