Walk, walk, walk. Whenever something goes to your head, just go out for a 30 minutes stroll and let your body/mind relax. It will not solve any of your problems, but improve your attitude for sure, which is a step in the right direction.
I know 98% of people aren't willing to try this-- but add in a cold shower afterwards and I become impervious to stress. And I'm usually a high anxiety person(have been my whole life). It's really a drastic, and honestly impressive, difference that it makes. This would almost definitely solve OP's problem, as it would for many people, the only problem is it's unpleasant enough that most are afraid to even try