I don't know what bc to get!!

So I'm currently at the doctors, waiting to talk to them about getting birth control for my period cramps. a short explanation on them, is they're absolutely unbearable to the point I've had to stay home from school, I've had to even go to the er, and NO medicine helps me unless its 600-800 milligrams or midol. I'm getting the bc so it could help with these but I haven't done enough research to know what the best one for me is. if anyone has any advice or information, please feel free to help me out!!💞💞💞