Hello backtothefuture: I believe this is your first post here on PC. So... welcome to PsychCentral.

Here are links to 5 articles, from PsychCentral's archives, that talk about OCD & how to manage obsessive thoughts:

Living with Obsessive-Compulsive Disorder

How to Identify & Manage Obsessive Compulsive Disorder, A Psychologist's Perspective

Some Ideas to Help Stop Obsessing

7 Ways to Stop Obsessing

9 Ways to Let Go of Stuck Thoughts

I hope you find PC to be of benefit.