Something's wrong with me...?! (again)?

So yesterday I didn't eat ANYTHING. At all. This is especially weird for me because I am a HUGE eater (but i get physical exersize so i'm not overweight or anything) i was hungry but something told me not to eat. All i had yesterday was a bit of monster and water. I woke up twice last night because of extreme hunger pains buty body is telling me not to eat!! I ate cereal this morning (less than a cup) and had a huge stomach ache... Help me please...