Please Dear Dr. please look this case. Thank you.

Here is the situation: Burning pain in pubic/groin area including penis. Some time vibrating like feeling around scrotum..but no pain on testicle. Always there is string like tissue come out with urine and when we looked in microscope it is full of white blood cell( ~ > 1000 or more). Also throbing like feeling deep urethra..symptom go until rectum. All feeling/symptoms are not continous..it is on and off.  urinalysis, urine culture, swab for Chl/gonn, cytology on debris in urine, ultrasound---all negative. Only Many many WBC with that sring like tissue debris and Amorphous phosphate(sometimes it was too..too much). emprical txt from urologist includes: Azitromycine, Erthromicine, Metronidaizole, Cepro., Doxycycline...pain responding for the drugs and come back after the end. Please Dr. if you have any advice on this. Thank you for your attention and time.