Haven't you felt a peculiar sort of worry about the chair in your living room that no one sits in?
I think everyone goes through chapters in their life and there was a time when I wasn't feeling terribly positive about what I was contributing to film, or wasn't feeling as if I was going in the direction I wanted and I re-evaluated what I was doing.
My biggest worry is I'm running out of time and energy. Thirty years ago I thought 10 years was a really long time.