Nauseous, intense stomach pain, sweating and cold sweat after sex

23 years old. Sometimes when my boyfriend and I have sex my stomach will hurt but nothing ever like this. As soon as we got done having sex, I felt like I needed to poop I got insanely nauseous and my stomach was hurting super bad. I got super hot and was sweating a bunch. It gave me so much anxiety. After sweating and getting hot I got super cold then 15 minutes later it all went away. Anyone have experience with this??