The most helpful actions will be
1)quickly repleting D levels. Quickly. Very quickly. I had a number of lupus markers for years. It took awhile to get rid of them but maintaining my 25(OH)D levels at 65 ng/mL finally did it. See my sig line for some vitamin D information. The vitamindcouncil.org will have much information on autoimmune disorders, it's worth reading it all....not just the lupus information.
2)ditching grains will be helpful...and possibly diary as well, but not as helpful as repleting D.
Interestingly, it doesn't really matter what the disease process is, the answer (at least in part) is optimizing 25(OH)D levels via sun and supplementation and ditching grains and sugar.