Can't find iPhoto Library
I recently upgraded from Snow Leopard to Mavericks (in january). After that my iPhoto disappeared, but would occasionally reappear when I plugged in my iPhone, iPad, and SD card. When it did that, all my photos were all in place and I could view them. The iPhoto icon was still in lauchpad with a question mark over it. It wasn't registering in the App store either, which wanted me to buy the app.
After browsing forums, I decided to delete the mysterious icon (by dragging it to the trash), and to reinstall it from the hard disk that came with the Mac. It thereafter registered as a proper app in lauchpad, but expectedly, didn't work as the version was too old. So I updated it through the App Store (where it also registered) but now all my photos are gone.
Digging through my time machine, I cannot seem to find the folder to restore, so I'm now lost.
Could someone please help me find my photos...