I've experienced deja vu. A very strange sensation for sure. That feeling of " I've been here and have seen this before!" So I relate this to the possibility of reincarnation. Space and time are relative to each other (space/time ) and can be warped and distorted by matter and dark matter, energy and dark energy. So time ticks at a different rate depending on these properties. GPS satellites are calibrated to compensate for this because time ticks at different rate from the earth surface compared to the orbit of the satellite. Whew! Hope I got that right!.....so with that being said I suspect that everything that has happened or will happen,exist somewhere in the infinite vastness of space/time. So when I experienced deja vu it may be some kind of glitch or fold of space time that I for some unknown reason can momentarily perceive. P.s an alien once told me "to travel in time is to travel in space!" Forward or backward. He! He! He!.

well, what was it like for the trillions of years before you were born? it's the dying part I'm not keen on. you won't care about being dead because you will be dead.

We are stardust...that's a fact and we will return to stardust.

Maybe you should not think about dying, and think about living. If you think about living whilst living, and leave thinking about dying for when you die then it's really easy.