Oh wow, that really sux man. I am sorry.

For everyone else, backup backup backup! After any deposit into your wallet, backup. And then copy the file to multiple places. The process takes 15 seconds. And can save you a bazillion.

But Hoodoo, do you have any old backup files from the last week or three? If do, then just load that up to a new wallet, and the blockchain should update your wallet to the right amount, yeah?