Does the card still work in the camera? Can you download the photos from your camera using a USB cable? Otherwise, I think you may have lost your photos.
I have a medium sized Olympus point 'n shoot. It uses XD media
Anyway, I discovered that, if I formatted the card in the camera, a card reader/computer cannot read the media, whereas if I first formatted the card in the computer, the camera can use it.
In hindsight, that's the kind of thing you need to check for before you use the camera for valuable photos.