Being a singer, being a performer, you have tricks, somehow, to calm yourself when things feel a little overwhelming. I don't do breathing exercises, per se, but I definitely have to have a sort of internal word with myself before things got completely out of hand and I fainted on the floor.
In my first stand-up acts there wasn't material even. You know, I'd go on stage and cry and read a Dear John letter or gut fish on stage. I could be odd - and it's what interested me as a comedian.