Prostatitis should certainly be ruled out, and can be difficult to diagnose. I would also be tested for STDs, like gonorrhea or chlamydia. This can be done via a urine test or urethral swab. You can also send any prostatic secretions (obtained via prostatic massage) to the lab for analysis and culture.
If prostatitis has been determined to be the cause, this normally requires a longer course of antibiotics.
You can also consider a transrectal ultrasound which can image the prostate for an abscesses - where drainage may be required.
You can discuss these options with your personal physician or urologist.
Followup with your personal physician is essential.
This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.
Kevin, M.D.
Medical Weblog:
kevinmd_b