Re: OCD and driving
My husband has this (and many) forms of OCD. It's very difficult to drive anywhere because he always thinks he hits someone. He has stopped (for the most part) going back to check on people, we have practiced with exposure therapy, and he doesn't use his rear view mirror anymore. I can see the complete anxiety in his eyes when this happens, and for me, I pray we don't pass anyone on the side of the road. My husband's OCD is severe although he can function at work.
Good luck to you, and I agree the best thing you can do is practice!