I can't stomach food

I can't eat anymore. It's been weeks, I think. I've lost count. I can't handle eating food. It makes me sick looking at it. Eating is even worse. I have to force a meal down my throat. Even a small snack makes me want to throw up. My grandmother is getting pissed at me because I won't eat dinners that she makes or I'll wait until midnight to eat a small meal. I would explain it to her but I can't because I don't fucking know! I don't know what's wrong with me! Why does nobody fucking get that?!

I have tried. I've tried eating. I've tried nutrition/protein drinks. Is it stress? Am I getting an eating disorder?? I don't fucking know.