I THINK IM DYING PLEASE HELP !!!

I’ve been on my period for 3 weeks and I’m not feeling well I have bad cramps and I feel like throwing up and pooping but it hurt when I tried.my period was gone for like a day and now it came back hard and strong.I have a date tmr it’s really bad should I go to the doctors I’m on birth control this all started when I was on active pills and now I’m on my sugar pills wtf is going on someone help !! Should I be worried!!! Btw I’m on sprintec and this all happened when I skipped my break week and started a new pack I hate this I wish I didn’t do it. I’m in so much pain!! Help