I don't have such a severe case that I wash my hands a12 times in a row or check the door 8 times to make sure it's locked, but I definitely have some quirks that I can't let go of.
I want things all lined up the same way. Money in my wallet, frozen foods in the freezer, clothes in the closet - they all need to be facing the same way or I cringe when I look at them.
I have a few BDD issues too. (Thanks, Grandma!) Those have been the hardest to deal with, by FAR.