I'm new here but I've read this topic. I have sort of the same problem. This afternoon, I was watching my pictures on my camera, and then I made a picture and deleted it. After this I made another picture, but my camera was processing for a long time, so I put it off. I put it on directly after this, and I made again a picture. The same thing was happening, the led light was flickering constantly and the camera was processing. I couln't put my camera out this time and I couldn't do anything, so I waited. After I waited it showed my SD card was somehow broken, and I could press help, and it said if I wanted to format the SD card, I didn't do this.
I started up the computer, and plugged the SD card in. Soon as I clicked at the G: drive. It showed it didn't work well and if I would format it. Again I didn't do this. After I searched at the internet and I found out I should use a recovery program, I installed several programs, but they all suprisingly did remark the SD card, but didn't manage recovering the card. Every program searched for a while but without any succes. I can throw the SD card out 'save' as normal, but everytime it showed if I wanted to format it. I were almost sure that the pictures were still on the card. So at the end I watched a video at Youtube and noticed, I had to format the SD card first, and the other things will come along with it, because you can by then get into the SD card. So I decided to format the SD card, following exactly the steps in the video. I had to press right mouse button and click format... and then quick format, I did this, and it asked if I were sure, and I clicked yes. But after a couple of seconds, a window popped up and it said the formatting failed in finishing. I decided to reply also on this topic so I hope someone can help me with this problem, because I'm afraid my SD card doesn't work anymore.