Pain when urinating

Patient: My girlfriend and I had unprotected sex,On the 6 January last week Wednesday I had pain while urinating I went to doctor and they said it was gonorreaha bit they never did a test my girlfriend went and had the test full and it all came back negative,The doctor gave me an injection and flagyl but I feel I’m geting worse

Symptoms: Pain when urinating slight pain in one of my trsticles