Not to alarm you, but I'd be pretty intent on getting a good checkup. It seems as if people probably think you're exaggerating because you don't hear about people wanting to put on weight very often. Are you taking any medication? Even things like antidepressants can have this effect on you where the simple thought of food will make you want to vomit. I was on a few and lost around 20 lbs and couldn't even stomach a full meal. There's so many possible causes for this and for the doctor to shrug it off is wrong. Your stomach probably shrunk so that eating a full meal is almost an impossibility. Stretch it out with fiber and lettuce! I'd advise to do that slowly though. Mine was so shrunken at one point that even eating a salad had me doubled over in pain. If all else fails, hangout with an Si ego LOL