Pain and nausea after sex

Does anyone else get really bad abdominal pain like cramping after sex? I have had this I few times I get extremely bad cramping I have to sit on a toilet curled up and I can’t walk, I begin to sweat and get really hot 🥵. I generally have to sit in a cold shower all try lie down on cold tiles. I then generally get nauseous and throw up after I throw up I feel a lot better and the pain slowly goes away. I’m just wondering if anyone knows what this is or why ?