How do i know i have gastroenteritis?? Okay, I threw up a few days ago and my stomich hurt, And i assumed i got it from my sister. And it has been a few days since, Iv eatin bannas, Drank water, And ate toast, And all that time, I felt like i was getting really hungery, And i had no symtomes. So i ate normal fast food, Like wendys, and i felt fine. Then the next day, I ate some mexican food, And i got a stomich ache and i got my hunger back, i sat up all night hungery not knowing if im still sick or not. How can i know when i can eat right, And if i am still sick, Whats really filling that i can eat??