Hi, I have the same obsession with my intelligence and perfectionism. I fear that doing certain actions or even eating certain foods will decrease my intelligence. For me, my intelligence is all my life is made of, it's the only thing that has gotten me this far. I know I shouldn't be one worrying, considering I scored a 31 on my ACT with a 35 in English and 34 in Reading (my math destroyed my score :P) and have numerous Subject Tests that I have scored well on and have made it into a great college. I guess it is a characteristic of my OCD to always doubt and be paranoid, I am also a big checker. The Prozac has helped me with this greatly though, it helps me stay in control. Anyways, I wish you the best.