I received unprotected oral sex from a girl, one night stand. A week later I started to feel an uncomfortable pain from my penis, sort of burning, sort of stabbing or sharp pain. However, no pain or any discomfort while urinating or from orgasm, actually eases the pain for a while. Also, my boxers are now always wet. I haven't SEEN any discharge, but my boxers are wet almost all the time now.
These symptoms went on for about 3 weeks before I saw a doctor. Still waiting on results from urine sample and blood test, though HIV test already came back negative. During examination, doctor saw nothing wrong with penis, and she didn't see any signs of irritation. She also asked if I've seen crusting on my boxers, but I haven't. What could be causing this?