Agree with the above -- many of us do this. One thing you might try just to feel better is to write this stuff down -- that often gets rid of it, and it provides a rich account of what you're thinking. Who knows, maybe there's a writer inside of you.
I totally forgot to say that if I am also not sleeping well. It's my job. I either sleep all the time or not all, But if i were being completely honest, i have slept less than 10 hours since waking up Friday (4 days ago). This is the first time that I have been honest about it..