This is something I struggle with a lot also - I started falling a lot more once I started working and had the additional element of stress in my life.
Things I find work for me:
a) Have some brief outlet that you enjoy that you can use to relax for a short bit at work. (For me, it's having nature documentaries on my phone that I can watch for 5-10 mins. Quirky, yes, but it helps sometimes.)
b) Stretch for 5 mins.
c) Go and talk to another person - it can be about anything, you don't need to talk about the fact that you're triggered and want to look at p*rn.
d) Regular (i.e. 1-2 times a week) exercise. This is the biggest thing for me. It's tough initially to make time to do it, but I can't overemphasize what a difference it makes in relieving stress.