Help! I lost all my pictures in iPhoto!

I don't know what happened. I was working in iPhoto when I ran out of power. Put the power cable on, restarted and all my photos were gone, as well as albums etc.
In Finder I can still see them, but I can not reimport them to the library- I get the message "Unreadable files: The following file could not be imported. (The file is in the iPhoto Library folder). Does anyone know what happened and how I can get them back? They're not in the trash, either.
 
sad I’m very sad and frustrated
Inappropriate?
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