Most STDs can be easily treated. However with possible spread, things like prostatitis and epididymitis might occur and make treatment more difficult.
I would assume that common causes like gonorrhea and chlamydia was tested for and appropriately treated with antibiotics.
I would consider a thorough prostate exam to evaluate for signs of prostatitis, as well as a scrotal ultrasound to evaluate for any inflammation suggestive of epididymitis.
If these disease are present, then longer courses of antibiotics (i.e. several weeks) may need to be considered.
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