Frannie, all that I really can advice you to do is to try to learn how to relax in situations. If you find your brain getting stuck in one of those "over-analyzing" periods, try to focus more on the outcome that you want. Keep your thoughts pointed towards that and away from all of the myriad of thoughts that are racing through your head. Also, if it seems like an impossible thing, you might want to try with smaller things first and then build your way up to something that would usually cause you to feel like you're going insane. Just give it some "open space" and I think that you'll be feeling better.