Menstrual cycle problems

I've had my period since I was eleven. The first few didn't have a great amount of pain. I have extreme breast tenderness 2-3 days before I start, my back starts to ache as well. Once my period starts, I have such bad cramps that I feel it in my back and causes me to be nauseous. On a scale of 1-10, i would definitely say 9.8. I also get really bad headaches and my vaginal area gets really sore. Nothing works except for midol for about 10 minutes. What could this be? What helps take the pain away? Why is this happening?