Ive been getting these sensations the last few days. I typically feel it most in the evenings. It even happens if I hear a loud noise and something scares me but its like a jolt inside my head/ brain. It is so extremely hard to explain. Its a similar feeling when you drift off to sleep and you twitch you know? I DO NOT take medication nor have I recently come off of any. Why am I getting this all of a sudden.. im starting to worry its caused by something other than anxiety or depression and its stressing me out so much.