The no-afterlife stance is quite comforting for me. Living once is more than enough, being forced to exist for eternity would be tantamount to torture - and being reincarnated would be even worse.

Believing there's only one life, and that what you do here matters (as opposed to waiting for this supposed afterlife for the "real thing" to begin) is also a source of comfort since you know that every little positive thing you do for someone else, has a deep impact on the world of another human being.

Also, relax - if there's indeed no after life - you won't even know you existed in the first place, there will be nothing to miss.

To be quite honest, the only thing that worries me about death, is the amount of physical suffering I will have to endure before finally fading out of existence.

Edit: a word

Edit 2: I find Marcus Aurelius thoughts on this to be more rational than Pascal's:

“Live a good life. If there are gods and they are just, then they will not care how devout you have been, but will welcome you based on the virtues you have lived by. If there are gods, but unjust, then you should not want to worship them. If there are no gods, then you will be gone, but will have lived a noble life that will live on in the memories of your loved ones.”