Help with OneNote

So I recently updated my computer to Windows 8, and installed the OneNote app from the Store. After doing this, I noticed that the Note I had pinned to my Lumia 920 had disappeared. After opening OneNote on my phone, I noticed that the whole Personal Notebook is gone. The only Notebook left is Tim's Notebook, which has Quick Notes in it, which is empty. All the notes I had made on my phone in the last 2 1/2 years are gone too. I can't find them on Skydrive or on the OneNote application. I really would like to get them back, does anyone know what might have happened to them? I appreciate any advice. Thanks