iPod Touch memory is full but says i have no music of video files

I have an 8GB ipod Touch that has been working fine. I have it filled with plenty of video and music, plus some photos.

I listened to the ipod on my way to work, and when i plugged it into my work computer, it said that there were no files on it; no music, no video, only photos, yet...it says that the ipod is almost completely full. Basically, the memory is used up, but the ipod is not recognizing the files. I tried resetting, turning on and off, reconnecting and making sure i had the latest software. I'm trying to avoid restoring it, and wanted to know if anyone had any problems similar to this.

Thanks.