Immaturity at an Advanced Age

I told a client today, in anger, that I'm tired of micromanagement and fed up with dealing with people who don't have their own jobs to do and so they try to do mine. I had intentionally not responded to an email yesterday because I knew I would lose my temper if I did. So I waited until the morning when I thought I could be more calm and less stressed out. It didn't work.

I wish it had, but it didn't.

So, maybe I screwed up big time. I sometimes think I'm trying to sabotage myself. It's the coward's way out of an unpleasant situation. I should grow up and resign the fucking account and deal with the consequences or, if that's too ugly, just deal with it.