I have found magnesium helps me, but I think just because I was deficient due to general nutritional deficiency (I can't really eat anything due to some digestive dysmotility). My legs were feeling weak and knees burning, and I was having problems getting decent sleep. Magnesium supplementation seemed to help with both.

As far as my other issues, and in the past when I ate food, celiac tends to result in malabsorption of many nutrients, which probably contributes to symptoms.