Why arent I eatting or drinking?

Well I had this stomache since friday and it has not gone away and now it has become so bad that I dont want to eat and drink becuase it feels like i am just going to throw it up. I ate a little pice of toast and ginger ale yesterday (tuesday)and it felt like I was going to puke my brain out!!!! But I didnt and that was about the last thing I have eatten and dinkin. What is worng with me.