Unless you're really lucky and find a way to recover from that backup file, you've probably just lost the money.
That happens to people all the time when they deal with money while they better shouldn't :-(
In hindsight, what you should have done (I know this comes too late):
- make a backup of your wallet as quickly as possible (such a backup works even if you receive coins later, because depending on the type of wallet key generation it covers a moderate amount of future keys, or all future keys for HD wallets)
- don't handle money while being drunk, drowsy, sleepy etc. unless you know perfectly well what you do and can take the risk of mishandling it (such as paying your bill after an evening at a bar.)
Onkel Paul
Have you looked at
http://bitcoin.stackexchange.com/questions/29586/how-do-i-extract-my-private-keys-from-a-protobuf-wallet already? It won't help if you can't find the password that you used for the wallet, but might help you to spot mistakes that you might have made during your attempts at recovery. I don't use that wallet app, so I don't have first-hand experience with it.