Thanks, Twitchy and Fela, for your helpful responses. You're correct, ALS (as well as multiple sclerosis and parkinson's disease) is what I was worried about. When you research muscle-twitches online, you learn that they are an early warning sign of those conditions, and then the worry and anxiety starts. It makes it hard to sleep. It's a vicious circle, as the muscle twitches make the worry and anxiety worse, and then the worry and anxiety make the twitches worse, and it becomes impossible to sleep.

My muscle-twitching actually did start in one single place in my right hand. I didn't give it a single thought, wasn't worried about it. But after a few weeks, it became random all over my body. Sometimes I can see the muscle twitching. Then I went online, learned about it being an early warning sign of ALS, etc. , and became very worried. I saw my primary care provider, who referred me to a neurologist. The neurologist is all booked up until January, so I must wait until then for an appointment.

On this very forum today, I learned about a condition called Benign Fasciculation Syndrome. Then I researched that, and it seems similar to what my symptoms are. That was reassuring, and maybe that is what I'm experiencing. I'm just going to wait and see how my neurology appointment goes.

Thanks once again to you both for your helpful and reassuring information.