Try taking any old photo and checking if your camera, your computer (if it has a card slot) and the photo shop machine can see that one. If it can, your other photos have gone. If it can't, then either the card or your camera itself is kaput (or, unlikely, the card contacts are dirty).
Best of luck

Mike
EDIT: There are Unerase programs out there which will recover deleted files from a disk. I've no idea, but they may be able to do the same thing for a card - worth a try. (But, as Crowsashes says below, don't try the "take another photo" test if you're going to attempt this)