Megan, I hope this Dr. House can figure out what the true cause is. Hopefully he has a clue and knows to look for something infectious. Given the fact that it sounds like you are withering away to nothing, can you can some marijuana and use it not only to calm the nausea, but to possibly increase your appetite? I don't know if it'd have the latter effect on you or not, but it sounds like you need some calories in addition to your nutrients.

Kind Regards,
Jay

Almost all of us long for peace and freedom; but very few of us have much enthusiasm for the thoughts, feelings, and actions that make for peace and freedom. - Aldous Huxley

Was the government to prescribe to us our medicine and diet, our bodies would be in such keeping as our souls are now. - Thomas Jefferson