I've been having severe pain when urinating and small blood clots in the urine. It hurts even when I'm not peeing. But when I go to pee, its difficult to push the pee out. When it gets to the end of the stream, the pain is so severe, I alost pass out. I thought it was a uti but I took the test they sell in stores and it came back negative. It's not stones because i have no kidney pain. My sides ache though. Any ideas what it could be? I've been keeping myself well hydrated and clean. Also, I'm 17 and female.