Help!

lo
My urine smells a bit off and my bladder area (I'm assuming) is constantly feeling uncomfortable.. It's not pain.. But this disgusting feeling that happens often after I pee and lasts about a half hour. It makes it hard to concentrate on anything else and I don't know what it is or how to soothe it. Sometime it stings when I pee, but not every time or too bad.. I'm not sure if this is a bladder infection or possibly something to do with sex, as it sort of started happening after a night of intense sex. Anyone have any ideas or comments? Advice?