Help! Total System reset after upgrade to mountain lion!

I just upgraded my Mac pro from Lion to Mountain lion. At first, it was running slow, seemingly because of all the social updates. So I turned off notifications for Twitter, email, etc.. I ran disk utility and repaired the disk. I restarted a few times. It was working better after that. I did some work, then shut off my computer.

This morning I started my computer to what looks like a freshly installed OS! My dock is smaller, because all of my bought apps are missing. My personal photos are missing, documents in the download folder, folders on my desktop, all missing. I looked in the app folder and see Aperature still there but a social app I use Adium shows as a phantom icon.

What could have happened?? How can I retreive my old docs?

Any help is appreciated!