Note that I don't take any SSRI'S. I know that it's a withdrawal symptom. But so  can stress cause this. And I was really stressed a few months ago. Anyways... After a strong brain zap I've been dealing with an unusual balance. When I stand it feels like I'm standing shaky ground. It's not intense but the feeling is there. When I lay down I feel like I'm moving in an up and down motion and I get the hypnic jerk feeling without the actual thing on the back of my head. Although I don't know how to describe it properly. So I'm just wondering if there are some of you dealing with something similar.