Welcome to PC, Scopri.
I struggle with this same problem. It causes me a lot of anxiety, sometimes panic, and I can't seem to shut it off at times. It has gotten to the point where my brain has gotten so adept at analyzing things that when I think about something it just seems to dissolve, or disappear, and loses meaning. It freaks me out. It's one of the most painful aspects of what I live with.
I wish you well in finding ways to cope. I myself have not found anything yet, other than distraction, which works part of the time.