Okay the tip of my penis has been burning while i urinate for almost 3 or 4 years. i have not paid much attention to it . on a scale of 1 to 10 with 10 being the worst sometimes its 7 SOMETMES ITS A 1 somtimes it dosent burn at all. I decided to go to a urilogist just before summer started like in april and he did a urine test and it came back normal he said it was most likely a UTI and gave antibiotics for it.I took the antibiotics and it still burned so i went back to him. he did another urine test and looked at my balls and said everything looked fine its probably an inflamed prostate and gave me some antibiotics for thaT. I have been putting off on taking the antiobiotics for a while i actually just picked it up from walgreens and started taking it last sunday so i have been taking it for almost a week and im supposed to take 1 tablet twice a day for 3 weeks. It wasnt burning this whole week while i urniated accept for these last 3 days...is the antibiotic not working or should i give it more time? what if that doesent stop the burning could it be a cancer? im only 19 and im VERY athletic idk if that means much. and the antibiotic im taking right now is called SULFAMETH/TREMRTHOPRIM 800/160. All you opnions are welcome and i will read everyones. Id perfer people that know what they are talking about to answer. thank you

I have also done plenty of blood tests all came back good.
I have no other sythomps but the burning.
Sometimes when i ejaculate it burns after.