Autoimmune disorders all have a common root of gut dysfunction. I suffered from chronic inflammation for five years, the ultimate solution was a double capsule probiotic and eating more fiber. Most probiotics have a single capsule that opens in the stomach and all those CFUs are killed by stomach acid.
I also have struggled for years with IBS-C, SIBO, food sensitivities, chronic inflammation, and mood disorders. It all started with multiple parasites and infections (e. Coli, giardia) from a year in India.
Rifaximin, an antibiotic, helped reset my gut and symptoms would disappear for a while but slowly creep back.
The thing that finally fixed it for me a little over a year ago is a well formulated probiotic called Seed. They have a fancy capsule that helps it survive stomach acid before delivering the goods to the bottom of the small intestine. I had tried many other probiotics and every home fermentation project before that to no avail. Within a week of taking Seed I felt 90% better, and the improvements have stayed with me for over a year and going back to a normal diet.