I have a terrible case of OCD too. I find that immersion works for me. I will do whatever it is my ocd prevents, and take whatever measures are nessacery to prevent any Ocd rituals.
Example: Lets say you're a germaphobe. ( I know you're not, but as an example...) Putting your face on a public object and then not washing it would be hard for a while, but then seems easy. Almost like the drive to bathe your face after toutching things is gone. It is sort of like breaking through a wall, into an OCD free zone.
Mind you this only works temporaraly, for me at least.
So, Immerse yourself.