Thanks for your responses. Unfortunately I have given in and had an HIV test along with my regular tests for the medication I'm on. I really couldn't overcome the worry
Testing wont help you, so please dont go for testing even if any clinic allows you, you are taking medicines already , so why dont you try cognitive behavior therapy from a psychologist
I am a fellow OCD sufferer with a concern about HIV too. I would encourage you not to get tested and tested unless you have had an exposure such as unprotected vaginal or anal sex, sharing of needles with a drug user or mother to child via breast milk. Other than that, you can relax, you are not going to get HIV. Believe me I have had every fear about it just like you. I don't get tested. It only brings temporary - or sometimes no relief- and then you will feel like you want it again the next time you are triggered. You have to hang in there, and let the anxiety pass. I know it is horrible and feels awful. I have been there a million times. Even today I have felt that way.
Dr. Jonathan Grayson has an excellent book about accepting uncertainty and risk as an OCD sufferer. I highly recommend it. Anything else I can do, just ask.