WHAT IS GOING ON SOMEONE HELP PLZ

ok someone needs to help me .. so monday night i slept at my boyfriends house and we had sex and after that i started getting lower abdominal pain where i couldn’t even lay with him my stomach felt like it was knotted and about 10 mins later i got up to use the bathroom and when i sat down on the toilet my legs were shaking and i started excessively dripping in sweat and my eyes were rolling back into my head and i was beyond dizzy. and i stood up and looked in the mirror and i was pale as hell.. i then fainted for a few seconds and he came to the door asking if i was ok and woke up and said yes, the stood up again to open the door and i fell again. and i dont even remember falling .. i just woke up on the floor. it’s now 2 days and i still feel this stomach pain.. what could be going on..