I am male 27 years old. About a week ago I had unprotected vaginal sex. Two days later I feel itchy and have burning sensation during take pee, and have discharge from my penis (I suspected it as STD symptoms). My tip of penis is getting swollen and red; it hurts. I have painful condition of my prostate gland too, and need to urinate more often than usual. I met the doctor and he gave me 100mg doxycycline for seven days (two times per day). The doctor didn t take a test. I took the medicine, but after 5 days it doesn t seem get better. Could it be prostatitis caused by STD bacterial? What should I do to treat it? Sorry for poor English. Thanks.