It’s not over if you kept a backup of the “wallet.dat” file that has the private keys to move your Litecoin. I forgot the exact steps on how to make Litecoin Core recognize the wallet (you should create a folder and add “wallet.dat” inside that folder, and it will become one of many wallets recognized by Litecoin Core), but there’s this forum thread: link.
Are you afraid that Litecoin Core has overwritten the “wallet.dat” file? I think there are separate folders for each one of them. In the worst case scenario (hopefully you’re not there), there are tools to find such file, even if it was deleted from the hard disk (see TestDisk).