I don't know if it's the same sensation, but I understand the feeling of the brain being detached. For me, it's like I'm watching my physical self as though I'm watching a movie. There's a disconnect.
In my head, I know what's happening. I'm fully conscious of my situation, and the ultimate outcome. I know the suggested steps to get out of this situation. Yet, my physical self is frozen here. Even when my mind screams RUN... my body just stands/lays/sits there. I no longer feel most physical pain. My mind goes to a different place.

I'm sure your disconnect is meant differently than mine, but I just wanted you to know that I 'get' the mind vs body/life disconnect in my own way.