Pms help!

Okay so I'm new to this, but I am 22 yo, and have always had pretty rough periods. Since I first started, it's always been pretty heavy and the cramps have been bad. As I've aged they get worse and worse. Now having puking, intolerable cramps, lower back pain that numbs my legs, and as of late, hot flashes and restlessness. I've gone to the er a few times for the pain and all they can really do is give me pills which I'm not much into. My gyno doesn't seem to have any concern but it's becoming unbearable. 
Does anyone have any tips or home remedies to help with the hot flashes? Or pain at all.