I have OCD... and I feel your pain. It's the reason I couldn't become an art teacher like I originally wanted to. I would draw something, and if there was one uneven line, I had to redo it, if it continued to be uneven, I would stay up until it was perfect. I have 10+ zip up hoodies, each of them have to be in the color order I put them in, and if someone buys me one, I refuse to put it in there unless I buy it myself. I have to sip my drinks three times each time I sip. If there is one imperfection in my nails or hair, I have to cut them or it and make it even exactly.
My door has to be locked all the time when I am in the room. I cannot leave the room unlocked when I'm not home and if I find out my room was not locked, I freak and have fits. So my mom has come to cleaning my room and has to make sure she locks the door when she leaves. Surprisingly, my room is fine, I don't care if things are touched except specific things, like my hoodies and my makeup, also my shampoos can't be touched and have to be in the right order all the time.
I also have ADD, so not only am I anal about things, I also do random things that confuse my friends, I also can't concentrate on certain things. It really sucks T_T