I feel like that sometimes, often in times of terrible depression. It's as if my brain short circuits. It takes a few days/weeks to reboot. This has happened to me since I was a little girl though. I believe it is part of a trauma response - the first time it happened to me was when my father died when I was ten. I remember feeling like I was floating outside of my body. Since then every time I became overwhelmed by emotion I would dissociate.

So I don't think it's necessarily bipolar but I understand what you mean.