Everyone should back up their passphrase so that things like this will never happen, I usually save my passphrase on notepad and save it on flashdrive, I also take screenshot on it and save the image file, write it on notebooks.
PROTIP: never send your wallet.dat to anyone... Unless you absolutely trust that person 110%
There are ways to attempt to crack wallet passwords that do not require you to send the entire wallet.dat file... And much more trusted services... Like:
https://walletrecoveryservices.comThanks for the tips, but I think it takes a lot of time and its not guaranteed but at least there is new hope to recover the passphrase.