Prostate problems would be the most suspicious culprit. Typically chronic inflammation or infection can cause the symptoms you describe. Some cases of chronic infection may require several months of antibiotic treatment.
I would consider sending some prostatic secretions for culture and analysis. A transrectal ultrasound can be considered to image the prostate and to ensure there is no abscess present. If so, it needs to be drained since antibiotics won't be effective.
You may want to discuss these possibilities with your personal physician.
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