Okay, here is my situation. I recently started dating a girl a month ago. Things have been going really well and yes we have been having sex. Well, I recently started getting a burning sensation when I pee. Then it turned into a really bad pain, and so I went to the doc. He said I had Urethritus but couldn't take any urine tests because of the AZO I was taking. So he prescibed me Doxycycline Hyclate and I've been taking that, along with AZO, cranberry pills, and A LOT of water and cranberry juice. Well, about 2 day later I noticed some yellow discharge coming out of my penis. I freaked out, told my GF to get an STD test and everything. Well she did and everything came out negative. I was thinking to myself, well maybe I got something from my last partner.....but I thought back to the last time we had sex. 3 months ago! I used a condom and everything was okay UNTIL I had unprotected sex with my most recent partner. Also, before the girl 3 months ago I didn't have sex for 6 months. This is really confusing me because I have the symptoms of urethritus....but I have the discharge which is yellow. I looked at my recent GF's negative test results as well....they are legit and from the university doctor. I have made an appointment that's in 4 days, but I just need some information. HELP!!!!