Unfortunately, at least in the US, physicians are ruled more by criteria set from CMS than by common sense medicine. So most likely that is the reasoning behind not giving you the NG tube until you are "medically emaciated." All I can offer are hugs and prayers, and I have a lot of those.
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"We can't talk at the same time! It doesn't work like that! I talk, you talk, I talk, you talk!!" ~ Peanut