Sounds like symptoms of OCD to me. Not in the traditional sense of the word either. I mean you are having obsessive thoughts about things or situations that you know deep down you don't agree with. Since "coming down" with candida sickness I have felt slightly similar trains of thought. I do believe OCD like symptoms are a part of this illness.
All that said, if you really think something's under your skull you should definitely get it checked out. No matter the outcome you can get that stressor off your mind. Hope this helped.