Burning sensation after passing the urine

Patient: My name is sudhir kumar, I had sex with calgirl last 3 months back, i used condom, but some how out of 2 one was teared during sex, then after some days i did HIV test, result is negative.after some time i have a problem of burning sensation after passing the urine, frequent urination also is their.I did culture test, ultrasound and no symtomus was found but till date i have not cured.Now i am showing to homeopathic doctor, still no progress. Please advised me what i have to do