I, too, had a colonoscopy, stomach and esophagus scope, blood tests, stool tests, and ultrasound of the abdomen that showed normal liver, gallbladder, and pancreas, though they couldn't see the small intestines. Everything normal. Except continuing weight loss.
Have you read about Sphincter of Oddi? It can constrict and cause symptoms like mine. My sister just had her gallbladder removed because of it, even though 2 hida scans showed normal bile ejection and function. I've researched it and sources say that STRESS can often cause constriction. I was under a lot of stress when given my Ativan prescription during an ER visit and the first month the Ativan certainly "relaxed" my stomach and gut enough for me to eat and process. Then it quit working. Then the rebound effect was horrific. And the diazepam I take now for tapering doesn't seem to relax my gut the way Ativan did. I think maybe different GABA receptor attachment? I don't know. I just want to live at this point.