All my files have disappeared

So I opened up Premiere this morning and every file I've worked on over the past two years is gone. WTF? Adobe opens up the way it did the very first time I used it--as if I've never done a project and it wants to guide me through the steps of making one. Every single video I've ever created is gone. Nothing in the recent files list. Even when I search my hard drive directly--nothing! What the hell is going on here? I'm logged in under the same account I've always had, but every file I've ever worked on--and that's a LOT of files--is GONE.