Hmm.
Well, not to pry into personal histories, but have you thought of some sort of treatment for this, that would help get you back on track? Believe me, I know a TON of people just like you, and it's really frustrating for them too. Sometimes I think I have something like it. It's hard for me to focus on one thing at times, unless I'm practically bound to a chair and forced to, and my mind just can't keep still. I'm always thinking faster than my mouth, which actually explains my stammer. .