...that I couldn't fall asleep all night, so I just stayed up trying to go to sleep until I realized it was futile, so then I started tweaking things on this site, and then accidentally messed everything up because I thought I was editing the Blog page, but I was really messing with the CSS for everything BUT the Blog page, and then by the time I realized it, I had messed up my entire look/feel and then found out there's no way to undo that in an easy manner?

Yeah me too.