While its possible that a poor diet and the inability to eat properly may cause problems with weight maintenance due to nutrition problems, it would seem odd that it would occur so rapidly. I would go back to your
primaryPrimary amyloidosis
Primary biliary cirrhosis
Primary hyperparathyroidism
Primary insomnia
Primary lymphoma of the brain MD for another referral to another specialist. I would also post this question in the other boards to see if you can potentially find an answer. I would try Undiagnosed Symptoms or Thyroid Cancer, Nodules & Hyperthyroidism