Should I talk to a doctor about my period?

Every time I start my period I get sick. I vomit around 3 times the first day, have severe cramping, hot/cold flashes, and my stomach gets upset. I also get very shaky, and all I can do is sleep. These last only the first few days, but the cramps stay with me the whole cycle. My period normally lasts over a week, too. Is this normal for some women or should I talk with a doctor?