what can i take to improve my appetite?!

First off, you want to make sure that you have a doctor give you a once over to see if there is any underlying reason why you aren't hungry - there are a number of chronic infections and structural issues that can make a person lose their appetite - then, while you are there at the doctors, ask them if it would be ok if you took a b-complex. As a side effect, it makes many people hungry (especially for carbs) but not everyone is a candidate for taking it.

Also - never underestimate the effect of Fresh Air - go out and move some if you have the ability.

Be well
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