I have real a lot of posts that say to click Command+Option while opening iPhoto and this will open the Photo Library Repair window, but... this is not happening.
Be sure you're holding the correct keys and that you're holding them long enough. Depress them before clicking on iPhoto and don't let go until the menu shows up.
If you don't want to lose those photos, make a back up now. Hopefully it's not too late.
Thanks. The problem was that in all of the "Hold Command-Option while clicking" instructions I read, none of them indicated that I should keep holding until the Photo Library Repair window opened. I thought holding while double clicking was enough. Thanks again!
As an aside, is Time Machine enough of a backup for my photo library?