What to do I am having Period Problems...?

I started my period at 11 years old and now Im 21 and nothing helps me. I suffer from excessive vomiting, bad cramps fatigue, diarrhea, loss of appetite and when I do try to eat or take meds I through it up. I have thrown up as much as 8 times during the day from this. But I only suffer from this on the first day of my periods. The condition in my body causes me to miss work and school at least once a month. I have tried over the counter meds, natural medicine etc and nothing helps. I am going to see a Dr. but I don't have a clue on what they will do but I need some help...