Feeling nauseated, sleepy, vomiting, weak, shaky, sugars are low, can't eat or drink without puking, eyes feel heavy. what could be the problem?

Possibly viral: Gastroenteritis (aka food-borne illness). Otc emitrol may help settle stomach as might pepto-bismol. Keep hydrated with sips of water/vitamin water/gatorade/ jello; gradually increase amount of fluid. Then can try brat diet: bananas, plain cooked rice (no milk), applesauce, plain toast (no butter/jelly, peanut butter). If not improved within day or 2, see fp for further work-up.