For about 2 months now I have had a total loss of appetite and have hardly been eating anything and anything I do eat makes me feel like I need to throw up or extremely nauseated . I'm rarely hungry and when I am I take one bite of soemthing then feel sick and nauseous. I got on birth control around the same time this started so I thought it was the pill but this has gone on too long for it to be that...what's wrong with me?