My son has GP and is now being tested for neuropathy.He as lost a lot of weight & basically can't eat now. He feels like food is coming up, though he never vomits, and burps get stuck with severe nausea. He has had this for several days and looks like he's wasting away......The doc said he'd meet us at the ER today if symptoms continue. What can this be and what should we expect???? So scared and frustrated.