IPhoto asked to upgrade library and has now come up empty even though my iPhoto file is over 130GB.  How do I get back my photos?

iPhoto asked to upgrade library and has now come up empty even though my iPhoto file is over 130GB.  How do I get back my photos?   I am using OS X Yosemite 10.10.1 with Mavericks.   My iPhoto is 9.6.   I am very concerned as this file has all my photos for the last 15 years!

If the iPhoto Library is still 130 GB large, your photos are probably still inside; perhaps the library has a corruption.
Or the iPhoto Library is on drive, that is incompatible with iPhoto. Where is your iPhoto Library stored?
To check for a library corruption:  Ctrl-click or right-click the iPhoto library and select "Show Package Contents". This will show the folders inside the library package.
Are there folders called "Masters" or "Old Masters"?
If there is a folder "Old Masters", you are having a problem with recent bug, that corrupts iPhoto Libraries when upgrading. In that case, it would be best to restore your iPhoto Library from a backup you made before you upgraded to Yosemite.
Or, if no backup is available, copy the "old Masters" folder to a folder on your Desktop and create a new iPhoto library and import the Old Masters folder.
If there is no folder "old Masters" try to rebuild your iPhoto Library with the First Aid tools :
Make a backup copy of your iPhoto Library, but don't overwrite any older backups.
To launch the "First Aid Tools" hold down the options-command keys ⌥⌘ while double clicking your iPhoto Library.
Keep the keys held down firmly until the First Aid panel appears.
Select  "Rebuild Database".

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