What would you do if the answer to the question 'am I crazy' is yes? What would you do if it's no? Would either reaction help your situation?

The fact would remain that you have a lifelong tendency to obsess that affects your well being. Please don't let the label take you down, if you can possibly help it. There's a lot of great advice above about how to begin looking at these issues. It does sound (to me, a non-professional who has no right to diagnose anything,) like an issue of perfectionism and invasive thoughts, and you are not alone in dealing with that, nor are you less of a person for having to.

Knowing that you're 'wrong' doesn't make it go away because the feeling is real, even if you don't want to have it. So how can you make this problem an acceptable part of your reality so you can begin to work through it?