Help! tons of pain during my period.?

my periods give me a lot of cramps, and i can't carry a heating pad to class. Advil and tylenol didn't help, and the only thing i can do is go home, and fall asleep. My cramps only disappear when i'm asleep. I can't stay at school either, because i get lightheaded, and according to my friends, i turn almost chalk-white. i'm normally very tan. when it gets very painful, i start sweating nonstop, and see little white stars everywhere. What can i do to help the pain go away?