My heart breaks for what you're going through. Lots of stories (including myself, family members, on this site and others) about going to numerous doctors for help and getting no help at all.

I was diagnosed with exocrine pancreatic insufficiency (EPI) this past January based on a fecal elastase test. It confirmed my pancreas isn't producing the enzymes to digest food and was put on pancreatic enzymes to help digest food and absorb nutrients. I was suffering from the fatty stools, major weight loss (I lost 42.5 lbs. since mid-November), malabsorption and the inability to eat much food because I got full so quickly.

Have you had a fecal elastase test?