I loaded up my recent project, without realizing that the external harddrive that has all my clips and ongoing progress wasn't plugged in. So when I laoded the project, nothing showed up, and it must have immediately saved, because now when I do have the harddrive connected, still nothing comes up as the half finished project I was working on. For some reason there is only one autosave for this project, and when I load it, it has my files that I used for the project, but none of the editing progress that I spent hours on is showing up in the timeline.
Don't panic: while you may have deleted something, it is more likely you are just not seeing it. First, I would thoroughly search the drives (internal and external) for any project files (.prproj). Don't rely on the list that PR shows you when it opens.
Were your project files on the external drive or internal?
Are your media files still on on the external drive? They should be.