Recovery of iPhoto books in iOS 8.0

How can I recover lost photo books from iPhoto after upgrade to iOS 8.0 on my iPad? Apples offers to migrate pictures from iPhoto to Photo, but why wuold I need that? I have all the pics! What I need is the text, setup and everything I invested well over 500 hours in preparing for printouts.

Please help... can´t help to think why Apple is doing this against users.