For me, it's either:
A) Nothing. No thoughts, no feelings, no emotions, no vision, no hearing, no anything. It's game over man, game over.
or
B) I somehow live some fantasy life that only one could dream of, if that turns out to be the case. I heard right before you die, your brain releases some chemical that puts you in the happiest place possible with vivid imagery, I dunno how long it'll last but...who knows.
or
C) Heaven and Hell existed. I don't know which path I am obligated to take.