So a very strange just happened, I wanted to eject my usb, I got a message that a some program is using the USB and I must wait, I ignored it and continued ejecting the USB like I always do (I definitely shouldn't). After some messages started popping up and the theme of the ubuntu xfce changed to default and all my files were lost, just like that, the hard disk was wiped clean.
here is a snippet of the log file : pastebin
I lost very important files, any help will be most welcomed.