Help me

Okay so I'm 17, my boyfriend and I were doing it in the shower from behind and he wanted to try anal but as soon as we tried I said it was painful so we went back to normal sex, he tried it again and I said no. It took some arguing but next thing I know I'm feeling light headed and dizzy. I told him I was going to faint so he held me up. I passed out and I don't remember what was happening in the little dream I had but I woke up shaking like crazy and him shakin me. He told me I had my arms right together above my head and having seizure like movements and I looked possessed almost, he was crying and look scared of me. What's wrong with me!?!?