As I said, I didn't have it for Standard Grades either. Which is weird, because I'd hardly done a jot of work towards them.
I don't have exams but I have huge "assignment stress" right now. Two assignments, two weeks and I have to get a 2:1 argh help.
The best thing you can do is get some proper sleep tonight - drink camourmile tea (with honey) and try and relax. Stress doesn't help at all.
The trick to dealing with exam stress is high quality hallucinogens and lots of them. You can't be stressed when the walls are dancing.