I have a few obsessions, And I have gotten over some of my worst but:
I get extremely anxious if I go anywhere with eye height cardboard. Its a horrible fear (I think its completely rational), Just typing about it is making me sick to my stomach.
Wash my hands probably 25-30 times a day, I cant eat if I don't wash my hands even if I just washed them minutes ago.
I wont touch my phone if I haven't washed my hands recently.
But I used to have to check all the door locks before I was comfortable in the house, even during the day the doors needed locked.