Oh, SUCK! I feel your pain, Proto. That is just ... There are no words. And now all that work you did you need to do ovner (what you want to anyway). Don't worry about the Halloween comic. Yes, it may be late and a pain in the ass to redo, but I know I'm still looking forward to it, even if it arrives late. Your stuff is always worth it! Sorry you lost everything, Proto. Hopefully you'll be able to redo most of it.
My sister did something like that to me not too long ago. There was a word processor document I had been working on for God-knows-how-long on my flash-drive. I left the computer (grandmother's computer... =_= Infuriatingly slow...) for two seconds, the document still opened and unsaved, when my little sister gets on, closes the opened document (without saving), and takes the flash drive out without making sure it was safe for it to eject. I have NEVER been so mad before. I swear, I yelled myself hoarse at her. Of course, she could care less, and kept on doing whatever it was she was doing on the computer. >_<"
Oh, I am sorry to hear that. I know how it feels. I once had a 24 chapter novel completed and edited. My computer went goofy and I lost it all. Believe me it bring about some colourful word choices; I totally understand how upsetting it is. I wish you much luck.