Unfortunately, I hadn't upgraded wordpress since installing the software, but when I did so, I didn't look at these instructions beforehand, and didn't backup. I used FTP, and deleted all of my old wordpress files, and then uploaded the new ones.
I now know I should've saved the config.php file, and some other things, but I didn't. Is it possible to recreate those files?
Also, is my blog content totally gone? I have heard I might be able to get the content from my MySQL database... is this so? Thanks.