My legs and different muscles jump and twitch since I got the head injury that I'm recovering from. And my hands shake too sometimes. And I never had to deal with this stuff before the accident at all.

It doesn't happen to me any more before I have to go to bed than it does during the day though.

It really doesn't worry me much at all but generally just reminds me that my brain is healing and that I used to be a high functioning, independent adult that didn't have to deal with that and then that usually makes me angry at the guy who caused the accident. (He wasn't paying attention in stop'n'go traffic on the freeway during rush hour.)

I do know that people who have sustained one concussion are more prone to getting ALS and Parkinson's and other scary things, but I think your Dr. would know what signs to look for if something like that was beginning to happen to you. I've also read that anxiety can manifest itself in many ways.

edit to add a "hug"