This reminds me of derealization and/or depersonalization.

I feel for you, Wander. I do believe that I understand entirely. I experience what you're (so well) described fairly regularly. My pdoc insists that I have repeated mixed-state episodes. When I read "I feel like I am living all my life in one moment", I quite literally got chills. I don't know that there's anything to help (at least, nothing has helped me when in that state - certainly not medication, and most certainly not Seroquel, BUT we must, of course, bear in mind that each of us reacts to meds as individuals).

Will you be having ECT for depression episodes, or is it given for BD as a whole?