tool,
I have a friend with OCD and it's really interesting how it can manifest itself in different people.
The issues you are dealing with might be helped with figuring out WHY you are having these images, instead of trying to get rid of them. I've been reading Win Wengers "Einstein Factor" book and it has some really interesting techniques for dealing with our mind and our thoughts.
For whatever reason, you are generating these images and seeing them. It might be worth the time to try and see if there is a reason for it ..
You might try some of the techniques for Image Streaming on Win's site, he also has a Yahoo group that he posts frequently on. (http://www.winwenger.com)
Hope this is useful.
Tracey