Missing playlists/collection on Rekordbox

I'll explain. 

I use Itunes to manage my music library which is located on an external USB always plugged in my laptop. 

That means Rekordbox always uses the external USB to locate and load the songs. 

Recently this external USB seriously broke down and I lost all the music inside. 

From that moment all my playlists on Rekordbox disappeared, since the USB unreachable...
I know this has to do with the Database set on RB, but I've never deleted those playlists.
They should be somewhere... they're not supossed to be a part of my external drive. Are they?

They must be on Rekordbox data files somewhere, right?

I've tried many things but nothing seems to work. Some help would be much appreciated.