READ. HELP.

so my boyfriend and i were having sex and i’ll tell you right now it was so good😍. he was stroking really heard and i mean it kinda hurt but not enough to be uncomfortable. we finished up and like not even 2 minutes later i was in agonizing pain. my stomach was in knots, like horrible horrible poop/period cramps. i felt nauseous. and as if i had to poo. i went to the bathroom and tried to do my business but nothing was coming out. i started to have trouble breathing and i was sweating and crying from the pain. i ended up putting a heating pad on my stomach and vomiting up my whole lunch. this was about three hours ago and i don’t feel nauseous anymore, and the pain is better, but still there. can anyone explain why this happened? i’m so confused and concerned