Your only hope is to see
[Tutorial] How to find and un-delete Writer temporary files for
a) detailed instructions on how to recover your file as it was when you last opened or saved it, or as it was when it was last saved with AutoRecovery;
b) how to find previous versions of the file in the folder it is located in, but which have since been deleted;
c) how to un-delete the temporary files Writer wrote while you were editing the file, and then deleted. This will recover your file as it was when you last opened or you last saved it and is probably your best hope.
It works for spreadsheet files too.