IPhone deleted 5 months worth of stuff?

I updated my iPhone around January & it deleted 5 months worth of stuff. I updated it through iTunes. I guess I hadn't backed it up on iTunes in such a long time so when I did update it it brung back stuff from 5 months priror to the update. Things I deleted. So I lost 5 months worth of things when I updated it. It really didn't seem like a big deal at first to me but now I actually need some information from that time span that was deleted. So I was wondering if there's a way I can get back my stuff that vanished when I updated my phone.

Hmm… Can you do a restore of the phone? If that fails maybe you can see what Apple suggests you do.