LibreOffice - any way to recover not saved changes to the file?

[Juan R.D. Silva]

I edited a file for hours and then mistakenly clicked "Do not save" 
while closing file. Auto save is not enabled. No backup exist in 
LibreOffice Backup folder. The computer is not restarted yet. Temp 
folder have only old version. Any way to recover the lost edited 
version? Or the only option to suffer the lost and to start all over again?

Appreciate any help.
Thanks