I want to eat....

I don't know that I've ever wanted to be able to eat this much before. I cannot eat. I've tried- but the repercussions are more then I can handle so I just don't. And I can't seem to eat something more than once. I made green bean casserole and ate it for dinner- couldn't stomach it the next day. My body is rejecting meat right now. I'm at my wits end. I have no idea where to go from here- and the stuff my doctor prescribed to help with nausea isn't something I can even get down. What do I do?