I recently noticed some discomfort in my scrotum and a 'different' feeling in the shaft of my penis. I'm not having any discharge or pain during urination as you would have with an STD. I got an STD test done and was negative for Chlamydia and Gonorrhea. I was on Doxycycline for 7 days and felt better during that time, but the symptoms seem to be coming back, but not as bad. Does anyone have any idea what this could be?