That's a tricky situation. It's hard to deal with stuff like that when you don't have a chance to prepare. I would offer a couple temporary solutions: google relaxtion techniques. Try self-hypnosis,...
I've had performance anxiety for as long as I can remember. Whenever I settle on a task but am being observed I spend more brain-power on worrying about being watched than I do on the actual task....
So I'm trying to figure out what's wrong with me. Whenever something that causes stress happens (date a new girl, yelled at by boss, running late for work), it kicks off this anxiety which lasts from...