Weird 😐

My menstrual started about a week after it was supposed to and its unusually heavy. Im on day 3 of my cycle. After being outside for a few hours i came inside to fix dinner, instead of that happening: I became extremely dizzy, threw up all the food I ate today, lost all control of my legs with walking, and passed out on the bed cold from being so weak for about an hour. Suggestions? What could this be? What do I eat now?