I cant sleep but im never tired or hungry?

its been about a year now and i wont sleep till 2 am and i go to school at 5 am but im never tired. also im never hungry and when i do eat i throw it up in my mouth bit by bit (ewww). its about 12 am now. I just turned 11 on march 17 (i dont care what the hell you put on my comments im old for my age) PLEASE ANSWER! =)