I am in the exact situation you described. Except I went on doxycycline and then a month later a round of cipro. My urologist has not been able to diagnose me either, with all bacterial and urinalysis screenings coming back negative. It has been 10 months and I still have morning irritation and small amounts of discharge with the urethral opening sometimes being stuck shut.
Overall I have no other physical symptoms or ailments. I have seen a urologist 4 times, and have had a cytoscopy with all negative results. I wish this problem would stop.
This discussion is related to
Morning Penile Discharge.