GAPS has been discussed here. Dr. Natash Campbell-McBride has a program for gut healing. Healing. It starts with meat broths and meat, cooked non-starchy vegetables, fermented veggie juice, whey from dripped yogurt - trying to remember what else. Stage two adds egg yolks.
As the gut heals, she introduces more and more foods. Eventually, the only things recommended against are the processed and sugary stuff we all know isn't good for us.
She says dietary fiber can cause inflammation in an already unhealthy gut, particularly in individuals prone to diarrhea.
I've been on the e-mail list for awhile and some of the stories of healing are very encouraging. She does say the ME/CFS is very complicated to heal and it can take some time.
What I find so frustrating is a total inability to access raw milk even if it is tested, cleared and certified basically because of corporate/government control. One person from Australia mentions in the comment section she had the authorities come into her chemist shop, where she sells raw milk for 'bathing' and they are forcing all customers to leave their names, addresses and sign something saying they only use it for 'cosmetic purposes only'.
Agree though on paleo/keto style diet for the win, but old habits die hard hey, might have to buy some shares in some organic cows which is one way to get your own raw milk; the raw milk for 'cosmetic/bathing' does not seem that readily available.