I have no idea what your cause is, but I’ll just share what happened with me.

Last year, I saw my first neurologist. Could you discuss a trial medication with your PC of a med to calm down the nerves? After my first neurologist, the tests were normal, but I had experienced extreme body wide fasciculations that could not be explained. He prescribed me one bottle of Clonazepam (small dose) to take as needed. No refills, as this med isn’t usually recommended long term. I try to avoid any medication that isn’t mandatory, so I was very judicious in my use of the med. I found it helped me relax and stopped the twitching. So, while I can’t be certain of the cause of my twitching, it responds to me relaxing. After that, the fasciculations left and now only return occasionally. They are random and intermittent. I now am able to tolerate them better and they leave on their own without medication. Oh, I also attend talk therapy and that helps.