I get twitching and body spasms. Some medications cause twitching. I take Lovan and it makes my body twitch before I go to sleep. Kinda annoying when trying to get to sleep. You can check out side effects of your medications on the internet.
Then there are other times when I get spasms in my neck or have the inability to step my neck from moving to side to side. They can get started from a thought or not feeling safe. My body disconnects from emotions and go into diverting it to movement.

Next time you see the professional who treats you ask them what they think is happening.