ok, you didn't answer my question. Have you checked your card on your PC? Can you transfer files? Do you have a space SD card you can reformat, take a picture, and see if you can see your gallery again?
I notice that your phone isn't connected to the PC. Have you checked to see if your card can be red via your PC? Transfer some file (photos) and test it.
If anything else, copy what you can from the SD Card to your HD, reformat the card, and copy back your stuff. The card could be the issue not being read by your device(s).