Mounted phone on PC and Lost photos, videos, music.. help please.

view full story

http://androidforums.com – Hi, I'm new here and looking for help please. I mounted my phone on the pc to save my pictures and all of a sudden everything disappeared from my phone. I've always done this and never had any problems. I also lost my music. I took the battery and sd card out and I did this a few times until I actually got my music back. But still no photos or video. I had over 250 photos and videos of my kids and pets. I need to get them back please. Is there a way? I'm not sure if I had them saved on the sd card or the phone storage since a while ago I had changed my camera settings to store photos on the (General)