It sounds like he may have a gastroparesis along with small bowel bacterial overgrowth and/or neuropathy. There are, however, other possibilities like coeliac disease etc that come into the equation. These are complex problems, and he would need to see a gastroenterologist to manage this. I understand that you want to manage the symptoms, but without a clear diagnosis, the correct treatment can't be given. I don't think that it relates to low pancreatic enzymes
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