Things like that have happened to me a few times in my life...it's why I'm now so paranoid about knowing where all my stuff is, digital or otherwise. But, occasionally losing things is inevitable.
In my case, I usually get really furious with myself for "allowing" such things to happen. So I try to just let the anger pass. I spend a few days mentally kicking myself and buying myself "treats", and playing too many games, but I don't try to fight it. I just let myself feel the feelings until they start to fade.
After that, I dust myself off and get back on the horse. I go through the things I lost and figure out which ones I can just go without and which ones were actually serious losses, and I set up a game plan to recover, if I can. The show must go on, after all.
Um, BTW, my paranoia and I would like to know if anything seemed wrong with your laptop before it supernova'd or if it just randomly up and died? Because, even though we just backed up all our files last week, we'd readily do it again to help ourselves feel secure. ^^;