First... You're NOT alone, your description of symp's & pain sounds a lot like mine & several others here. To me it feels like electrical shocks,(that take my breath away) & sometimes it even feels like there's a constant electrical current running through me, not to mention the muscle pain & twitches. So, we understand how frustrating it is being told our tests come back "normal."
Try checking out Marshall Protocol at marshallprotocol.com, it's a treatment for autoimmune diseases, I started in August, it's long term, but it's a curative treatment not just a treatment of symptoms. Look up Hypervitaminosis-D, & read the symptoms of this, also look through the "Essential information about the MP" link on there homepage.
I would also recommend running a search on Lyme, Fibromyalgia, CFS & CFIDS, MS, Thyroid & liver, & lupus. Here's some links that helped me, but I believe you will find what you're looking for on the Marshall Protocol website, I did after searching for answers for 15 years.
http://www.anapsid.org/lyme/symptoms/tbi-symptoms.html
http://www.aarda.org/women.html
http://www.Diagnose-Me.com
Keep in touch, K!
This may not be your problem at all but I suggest you look into Magnesium and Potassium. Worth a shot.
In my early years, I had bad muscle spasms. Which later seemed to be resolved with higher Potassium intake. During a very stressful time (and taking a powerful anti-biotic), I developed twitches during the day and bad "jolts" when sleeping. I tried Magnesium supplementation and relaxation. This helped, considerably. Read up on these two minerals and be certain they don't interact with any current medication that you may be taking.
http://dietary-supplements.info.nih.gov/factsheets/magnesium.asp