I usually carry a sort of "survival kit" with me whevever I go, including work. It includes a CD player with my mindfulness meditation CD ready to go, my journal, my Don't Should on Yourself booklet, and my Depression Tool Kit booklet. When I've been in a stressful situation, I will excuse myself, go find a quiet corner/office/meeting room and listen to the mindfulness CD. That usually helps enough that I can finish the day. If I need something more, I'll write in my journal and debrief myself there.
