It's like that perfection thing, trying to be that thing you're not. You have to feel that discomfort and not try to get rid of it. Accept that aspect and get into it. Acknowledge those feelings and let them be. You are who you are.
Often when I finish a film I'll have that feeling inside me: 'I never want to do this ever again. I don't want to pretend anymore. I want to be myself and do that.' And then, thank God, that feeling goes away after a month or so and I'm raring to go again.
Mania is a wonderful feeling.
You kind of notice what's going on in your body, and you can kind of feel a certain tightening, or fear, which is something that, as an artist, I've kind of befriended. I can pretty much count on it for anything that I engage in - that thing like, "Am I going to be able to pull this off?" Well, what am I gonna do with this feeling? The more nervous you get, the more worried you get about it. So you pay attention to what you might need.