Scared to death

Hi, I don't know how to start this but I am really scared. A guy gave me oral sex, his Penis went on me I told him I don't want any of this but he wouldn't listen to me and I couldn't push him off me. I think his penis went in me but not fully. Ever since I've diarrhoea and it burns when I go pee. I don't know what to do. I can't talk to anyone. Please help.