Hi heleneicole and welcome to the Q&A Board!
Sorry to hear about your problem with the memory card. Unfortunately, I'm not confident it can be fixed without formatting the card. You really shouldn't use a card with two different cameras without formatting the card in the camera you'll be using it in. Erasing images simply makes more space on the card. Formatting sets up the entire file and folder structure on the card for the camera. You can read about the differences between erasing and formatting here:
http://www.digicamhelp.com/erasing-and-formatting-digital-camera-memory-cards/If you format the card, you may lose images, though you can try to recover them later with photo rescue software. But formatting the card in your Fuji is the best bet to get the card working with your camera again.
Let us know how it goes.
Related reading:
Photo rescue and recoveryhttp://www.digicamhelp.com/digital-photo-recovery-and-rescue/index.htm