Hi Red_Rattler,
The first thing you should do is to check if the UserData folder is still "there", in other words, is it of a plausible size. If so, your data is probably still intact, only with about 10 million more errors. If otherwise, your data may be gone.
Next, open up CMP and let it run whatever repair/validate crap that it has to - I suggest you take a vacation to the Bahamas while you wait - then see if all your content is suddenly riddled with warnings. If so, apply filters "Local" and "Builtin=True", then hit Revert to Original and just sit and wait some more.
With any luck you should be good to go.