Love the sentiment!
The only thing any of us here can really do is to make sure you know you're not alone in your anxiety. About six months ago, when i'd finalized my list of prospective schools, I was feeling exhilarated and invincible. I was ready to knock out the applications and sit back and reap the rewards of a decade of hard work. Somewhere along the way--whether it was the GRE, or the essays, or the application fees, or the intensely competitive nature of this very opaque process--I lost that indomitable spirit. I know some people have it worse, as I don't think I'm to the point where I'm obsessing or rethinking everything like you are, but it's really all I can think about. I think my wife's going to strangle me if I bring up one more "what if" hypothetical.
Here's what helps me: Understand that everything is now 100% out of your hands. Life is full of mistakes, and if you made some, so be it. You've done what you needed to do; you completed your end of the deal, trudging through the arduous process of submitting the applications. The entirety of the outcome is out of your hands. Relax and try to move on. You'll get the notifications one way or another, positive or negative, and you'll be just fine win or lose. If you get into one of your schools, fantastic! If you don't, you'll have learned valuable lessons and gained experience that you could not have found anywhere else; you can use that experience to make sure you get in somewhere next cycle.
All the best to you--just try to get back to life until you get some feedback!
