Hi, two and a half weeks ago I woke up with pain on the tip of my penis, not around the hole, more on the side. The pain has never been as bad a sthat first day, but I am still experiencing sensitivity. I went to my GP and did culture and blood work for chlamyidia, gonorrhea, and herpes, all negative. I have no redness, no bumps or lesions, and no discharge. What could this be?