I Had A Cystoscopy 2 Months Ago. I Have Had

I had a cystoscopy 2 months ago. I have had pain and burning since and off and on yellowish discharge . I have been tested multiple times for std and urine infection and have done multiple rounds of different antibiotics to the point im sick from them and symptoms just get worse. I have seen three Drs. and no one has a damn clue what to do or what is going on pls advise ??