What Causes Excruciating Pain In The Vagina During The Intercourse?

I'm 18 years old and me and my boyfriend have sex on a regular basis. Last night we had sex and it was great like usual. However, today we had sex and it felt like he was hitting something over and over and over again and the feeling was absolutely excruciating. He was more gentle than he usually is, so I don't think it was my cervix. My pee is very cloudy and has a terrible odor. I can't figure out what is wrong.