I have had hives, headaches, nausea, loss of appetite, and weight loss for the past 3 weeks. I'm not pregnant, and nobody knows what's wrong with me. I think I'm allergic to milk, because it started 3 weeks ago, everytime I drink milk (The hives anyway). The doctor told me it may be exzema, but I know for a fact that it's not. Can you tell me what it may be? I am 17 turning 18 in june, i'm 118lbs, and 5'5. It has never happened before.