2 weeks ago I hade unprotected oral and vaginal sex, the next morning I woke up and went to the bath room, it burned when I urinated. I went to the health clinic the day after and got tested. I tested negative for everything, last week I went and saw my doc and told them what was going on, they did another test, gave me a shot in the hip and 2 pills to take as a one dose. I felt like it all cleared up until 2 days ago. It no longer burns when I pee but I've got a slight tingle in my balls, and a slight sting in my penis. Once again, no pain when I pee. My doctor said that their test also came up negative. What's goin on?