It sounds like a new OCD theme to me. And from all I'm learning, the more time you spend fighting and trying to validate or "fix" these thoughts, the worse they will get.. Can you say something like "Hmmm.. that's a strange thought, but it really doesn't matter whether it's a real memory or a fluke." And then let it go? I know it's easier said than done. But, I really don't think you're going crazy.