What happens after a human being dies?

To me, this is one of the easiest questions about life and death to answer. Not only is the answer painfully obvious but all of us, nonbelievers and believers, are able to imagine afterlife right here and right now. To do this all we have to do is 'remember' life before birth. Where were we then? What were we doing? What were we? We were nowhere and we were doing nothing. For an unimaginably long period of time, all the time that precedes our birth, we simply didn't exist in any shape or form, and following our death we will again become nonexistent for all the time that has yet to pass, forever. Our bones is all that will remain, and in time the bones themselves will perish forever.
'Ashes to ashes, dust to dust'

Realizing this and thinking about it just for a moment quickly brings about a feeling of indescribable sadness, imagining that we will never again see our loved ones, and makes the reason for the desire for more life, the afterlife, quite obvious. Hence, God.

What are your thoughts on this? How do you cope with the realization that this life is all there is, and all that there will ever be, forever and ever?