How do I eat?

I am hungry, but when I try to eat, nothing seems right. I can't make a decision on what to eat. When I do eat something, I quickly lose my appetite. I eat sweets and chips. I have never been a sweet eater and now that is all I want to eat. Someone told me it is "comfort" food. It doesn't seem very comforting. It doesn't seem like "me" at all.