I am afraid that the last few minutes of life will be like a confusing and disoriented nightmare. That has always seemed to me to be the most likely scenario as your brain is shutting down.
my guess is you slowly transition to simple machine with sense inputs and outputs until it all shuts down.
Death could be like that too. A flood of signals you're unfamiliar with and a lack of signals you're used to having.
It probably depends on how much warning you have and your willingness / readiness to pass as well.
Kind of like if you're really tired and can't wait to fall asleep vs. scared and trying to keep yourself awake.