Suggest Remedy For Urinary Infection

So I became aroused and got an erection and didn t ejaculate, and then I had to pee, but I was too busy to, so I didn t. It felt a little like I had let a little pee go down my urinal tract, but I didn t release it. Then about 45 minutes after my initial arousal, I was aroused again. Soon after, I started to get this intense burning pain in my penis. In an attempt to get rid of it, I tried to stimulate my penis to ejaculation, but the pain was to great. After I cooled off, it hurt less, and then went away after I peed and waited a couple of hours. I have also felt this sensation after being aroused and then urinating? How do I avoid this pain in the future?