i (20F) went to the ER yesterday and they said nothing was wrong with me- just my menstrual cycle

so i just started Tuesday around midday and it was already thrown off because of the size of the clot that started it. i then proceeded to bleed through a super every hour for about 5-6 hours straight, i got nauseous and starting having vomiting and diarrhea and the cramps were almost unbearable and started hurting in my lower back. i was getting weak and had a hard time walking because my legs felt like they were giving out on me. i ended up going to the ER because i had an almost 20 minute long constant cramp that would not go away. my WBC was normal so it wasn’t appendicitis or cholecystitis and i started feeling a little better after the meds they gave me…until about 4 this morning i woke up and it feels like i started the process all over again. i can’t get out of bed to do anything except go to the bathroom.

this just doesn’t feel like a normal or “bad” period. i used to get cramps to the point that i couldn’t go to school because i could only stay in one position to relieve the pain. i’ve had a period for 9 years and have never felt like this before. and yes i have been on birth control, the same one, for roughly 5 years and i still have never felt this way.

i just want to know if other people have this as a norm or if i do need to get it looked at a little better.