Sorry that you're going through this.
I'm not sure what medications (if any) you are taking, but I think certain antidepressants may tend to increase appetite, so you might want to talk to a doctor about that.
Making tea from ginger or cinnamon might help to stimulate your appetite.
The link in my signature has a sub-link on self-treatment, and there is a section on diet there. You might also want to check out the link on Chinese medicine and acupuncture.
I hope something can help.