upgraded to yosemite from snow leopard and can't finish the upgrading to iPhoto 9.6 I lost my photos.

I upgraded from Snow Leopard to Yosemite When I tried to open iPhoto it asked me to install version 9.6. I did so. Then when I tried to open it said that it needed to upgrade the library data. I left it for 10 hours. Before the bar is full it stops and it freezes and i have to force close it. It has the new icon but does not open or show new or old photos.