I had the aids fear too I've had it since I was about 14 it happened after a sexual assult. I've also had really deap seated fears that the end of the world is soon. When I was about 10 I saw the harvest moon for the first time and hid under my covers because I thought it was the blood moon from the Bible. Even now I check my kids while they are asleep to make sure the have'nt been taken in the Rapture. I did'nt think these things were OCD related but thanks for posting cause now I know how I can treat my fears and that I am not crazy