Try eating small amounts of Bananas, Rice, Applesauce, and Toast. Your body isn't used to food and these are the easiest on your body to digest. Don't eat the whole banana, eat a bite or two and see how you do. If you can't handle that, you might require a feeding tube or iv nutrition to get your stomach used to food.

We can't diagnose here because we are everyday people like you. If you are that concerned about not eating, I would talk to my doctor about it and see what they say. I hope you get the help you need so you can be a happy, healthy person.