For about 3 1/2 years, I have been experiencing a burning/stinging itching sensation around the head of my penis at random times (day or night). I did many visual checks of my penis and everything looks great. So I proceded to go to my urologist and have him check it out. He thought it was uretheritis so he put me on 14 days of an antibiotic. This didn't do anything. So he recommended a uretheroscopy and the results of that were: no findings, everything looked normal he said. I proceeded to go to two different doctors to get HIV/STD tests both came back negative. Then went again for HIV/STD again one year later and still negative.
I did have anal sex without a condom with a guy, and I was the top, not sure if it was that or what. I am in a commited relationship for 2 years now.
Now I have moved to a different state and still have the symptoms. I am just getting annoyed with it already and not sure what to do.. any suggestions..Please help.

Thank you very much.