This is what resolved 99% of my CFS symptoms, and I am hoping that fellow sufferers (and doctors) will at least consider it as a path to check out. It is sadly not on the radar of most doctors and sufferers, but conceptually (in hindsight) quite simple.
With exocrine pancreatic insufficiency...
Since there are just a few very old posts linking pancreas issues with chronic fatigue syndrome, I write this in the hope that what I have learnt over the last 4 years might help others with similar life changing issues. It is an avenue worth looking into in your quest to feel better. It helped...