OCD here as well, I do a lot of things that are OCD-"ish" I count things, I wash a lot, I have to put everything in a certain place, afraid/compulsions about some things, there are a few odd things, something that I don't feel are too severe. I check to make sure the door is locked more than I "should" I check the oven and appliances to make sure that they are off more than a "normal" person would...but I think I manage mine rather well NOW without any specific medication/treatment.
So, I don't think that it would be far off to think that there could be a connection with migraine and OCD.
We've already seen a connection with migraine and things like depression, anxiety, TMJ, restless leg syndrome, insomnia, fibromyalgia I am sure I missed half the list there...but you get the point?
I would at least mention it, who says you have to go into complete detail about the details and specifics of your OCD until you feel the DR out and see what the response is from him/her...you don't have to tell them that everytime you drive over a speed bump you think you've run someone over and have to drive back and check to make sure ir wasn't a person (I heard that story about a person with OCD and every once in a while it crosses the back of my mind after hitting a bump or pothole!)