My databases gone

hello , I don’t know what happend, but all of my databases gone ! I didn’t do anything !
my photoblog with WordPress Picturlial I,was running well , but after losing databasing it isn’t working anymore.
I have a question , are my notes (that were behind everypicture) available to restore? or they were in databases ?
please please , answer me to Medya@medyadaily.com