Phyllis
I have a friend with fibromyalgia. She has quit taken anything with aspartame in it. She only had one diet soda 3 times a week. On a trip abroad she had no aspartame, by the end of the trip her shaking left, and from needing to walking with a cane she literally could run. The only symptoms she has now is back pain but most has left or subsided greatly. If you use, aspartame you might try eliminating it and see if you have any relief. We're all different but I thought I would pass it along to you.