I don't have OCD, but sometimes I worry that I will forget something if I stop thinking/talking about it, so I go and write (type) it all up. Then I know I won't forget because it's all right there, and I can move on to think about other things. Maybe that would work for you?
Other suggestions: Distract yourself with something. You could try playing a game, reading, watching a good movie or something on TV, etc.