Totallly normal, totally fine. Your body is the one that suffers. Because of the increase in hormones, your digestive system slows right down to insure that the baby gets every possible vitamin and nutrient possible. I have lost weight at times because I was eating healthier.
Try to keep up on the prenatals. If they bother you, try taking them before bed. If they still bother you talk with your OB. They have samples in office that are specific for women with severe nausea and vomiting. Good luck and congrats