My Spotlight Won't Do Even Simple Searches!

I can no longer find any file in my Documents folder. Even when I put in the title of a document, it shows nothing. I've unselected Documents from the list of folders to check, in System Preferences.. Then rechecked it again, and yet, several hours later, still drawing blanks. This is quite frustrating and there's no reason this should be acting in this manner. When even the most basic, simple processes aren't working, something's really off.