I also have had severe muscle weakness so much so that my nuero was thinking myasthenia gravis(negative blood test). What I did find out is that is caused by carbohydrates which just sounds crazy I know. We still haven't figured out why? It appears to be very unusual.So if I stay no-low carb I can have muscle strength. If I eat carbs my muscles are mush, stair-climbing any activity that is repetitve-sweeping, raking. My parathesia in my legs and feet are much better now too. especially restless legs. Celiacs appear to be deficient in Vitamin D and B-12 of which I am and take large doses. I would always get a copy of your lab request and report and research yourself, there are alot of discrepancies of lab values out there. What was fine with my G.I. was very low noted by Naturopath. Good Luck and be well!