Angry with my boyfriend after sex?

I love my boyfriend so much! We've been together two years and talking about Getting married. However the last probably 4-5 months after we have sex or after I orgasm other ways, I get extremely angry with him. It's like instantly I want him off of me and away from me. And when he tries to give me a hug or a kiss I just lash out at him. I don't understand it. Literally seconds after I orgasm it gets this way. Maybe it's hormones maybe I'm going crazy. Is this normal?