Bitcoin disappeared after resetting the blockchain and transactions
Your wallet shows empty because it doesn't really "know" that one or more addresses that it controls "owns" some bitcoins because you manually deleted the blockchain files. 

It will display your correct balance once it synchronizes again, provided of course that you have not deleted the .wallet file.

I would also suggest you take extra care when deleting the .spvchain file, more at: https://groups.google.com/forum/#!topic/bitcoinj/vIbsMfd1NUA

Another approach would be to export your private key(s) for non-zero addresses and import them to a clean installation. Make sure you keep a back-up of your .wallet file somewhere safe throughout this process.