Consider sciatica. Mine comes and goes, but when it comes it is like an electric shock. I have lost several glasses and cups I was holding at the time! The sciatic nerve inflames and certain movements cause the electric shock sensation. Good luck. It could be so many things, so you have to persist to get the right diagnosis... just at the time when you are not feeling at your strongest...?
Is it rude to not finish a book club choice that was selected by someone else?


