It is impossible for us to make you believe that you have had a conclusive negative test. Seek the help of a mental health professional to help you deal with your issues.
you need Treatment of OCD -Treatment of Obsessive-Compulsive Disorder
I second Teak and ES, who rightly pointed out your problem. It was never an HIV issue, especially after getting your 13 week test negative. What else you are looking for, dude?