I followed all the steps in this and it mostly worked, the problem was the library is missing the last 3 and a half months of music adds and ratings. Is there any way to get them back?

Seriously this kind of *****. I have lots of music and freaked when it was all gone and I'm still freaking that I have to find the last 3 and a half months of music and rate it all over again. What can I do?

When I plugged my iPod in it said there was songs on the iPod not in the library and I clicked the option to add them to my library but it didn't seem to work.