I have iron deficiency anemia and haven't been taking my supplements because they make me feel sick. i haven't had any periods in the past 3 months.

VERY serious: Iron deficiency will prevent you from doing the tasks you need to do as a teen-ager -- learning, making friends, building future career skills. The cause must be sought -- are you a vegetarian? are you bleeding from a stomach ulcer or even a cancer? Parenteral iron is available -- ask about it. Not having periods is also serious and calls for a workup. Please get on top of this. Best wishes.