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What does the phone tell you is using the storage?

If we can't think of anything else, there's always the option of doing a factory reset. I know you said that this started with a spontaneous one, but there was clearly something odd about that beyond its spontaneous nature. The only reason I hesitate is in case your data aren't really gone at the moment, just you can't access them because the phone is in an odd state, because if you do a reset they really will be gone. Have you tried just rebooting, or going into recovery, clearing cache (just cache) then rebooting? Unlikely to help, but since we don't know what's wrong here I'd not rule anything out.

Of course the worst case is that there's a hardware cause behind this, e.g. a fault developing with the storage chip. But if that's the case nothing will help.
 
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Try accessing it via Odin with a computer and USB cable directly. Tons of how-to's on that subject available here, so I won't go into those details.
If you have a microSD card, you might try accessing it directly via pc as well. If there's anything there, it'll show up, even under windows explorer. If it is indeed blank but showing full, I'd do a full format on it under windows (w/default settings).
Sounds to me like you got nastied by some lil prick with no life. It happened to a friend of mine about 3 weeks ago. They nailed everything... his data, apps, contacts, the works. I hope you had a reputable virus scanner onboard (my friend didn't, hence the damage)! I don't trust the in-built android scanner at all... So far AVG has served me well, despite the annoying ads.
 
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