This is a little off-topic, but this paper links a whole lot of auotimmune diseases + anorexia to changes in the intestinal microbiome and the brain. This might give some clues to posters here who have similar problems.
MINI REVIEW ARTICLE
Front. Endocrinol., 12 February 2019 | doi.org/10.3389/fendo.2019....
The Impact of Starvation on the Microbiome and Gut-Brain Interaction in Anorexia Nervosa
Jochen Seitz, Meriem Belheouane, Nina Schulz, Astrid Dempfle, John F. Baines and Beate Herpertz-Dahlmann