Another vote for going for a walk! Sometimes mentally distancing yourself from a stressor can be tough, so physically removing yourself from the area of your stress can be an immense help
I also use herbs in either teas or sprays to help calm down. There’s a few of my favorite herbs for anxiety in the following post:
My most recent favorite has been Melisa/Lemon Balm- it does wonders for soothing the mind and helping to find relaxation even after stress
