You have already been on a variety of antibiotics and tests for chlamydia and GC have been negative.
I would now pursue other causes - including prostatitis and epididymitis. This can be performed with a thorough digital rectal exam where prostate secretions can be expressed and cultured. Epididymitis can be evaluated with a scrotal ultrasound.
If prostatitis is the case, 4-12 weeks of antibiotics are indicated. Another consideration is a prostatic abscess, which can be evaluated with a transrectal ultrasound.
I would follow up with a 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.
Thanks,
Kevin, M.D.