The author of... a paleo book, forgot the name... Neanderthin! Had RA and used a paleo diet to manage it.

Ray Audette, I think was his name. You might try googling "paleo autoimmune arthritis".

I was diagnosed with an autoimmune arthritis, but that diagnosis seems to be turning into osteo-, which I still feel like is autoimmune, or close to. Anyway, I found that grains, especially gluten grains, make me much, much worse. Dairy is also something I think I have issues with.

Some people believe nightshades (tomatoes, eggplant, etc) might be problems. Others find legumes (peanuts, beans) to be an issue.

I think there's a lot of possible dietary treatments that can help. Do some research and be open to trying different things, you may be surprised.