It might sound boring, but my number one coping skill is going for a long walk with my dog and climbing a very steep hill until I'm almost out of breath. It settles me down inside and puts air in my brain so that I can think things through instead of acting impulsively. I do this twice a day, for a total of 2 and half hours.

Other than that, if I can catch myself from overreacting, I take deep breaths and stretch my arms over my head. If that's enough to make me pause, I tell myself to take whatever issue it is and--for the moment--pretend that it just doesn't matter. If it's still an issue in an hour or so, I will deal with it, but hopefully with a clearer head.