Everything has disappeared from my SD card and when I use a recovery software, all of them only seem to find the photos before them.

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I have met this problem before. And the following links helped me recovered all my lost data. So I suggest you to have a try. Good luck!

I'd recommend that you download this sd card recovery software called asoftech data recovery, download from link below
http://www.asoftech.com/adr/

As mentioned, you'll need to use recovery software. But first thing that's very important, take the card out of the camera and do not use it further until you've recovered the pictures. Below is a YouTube video of your freeware options, and here's more info on how to use these options, and where to get them.

Take no more pics until you've recovered your photos, take the card out of the camera. This is to reduce the chance of you overwriting some of your "lost" photos. There are many good freeware photo recovery software options that may help you recover your photos. This article reviews and outlines several of the better ones:

dont worry, you can get back deleted pictures from camera with camera photo recovery software like asoftech photo recovery. You can download it from
http://www.asoftech.com

you can sue some picture recovery software to get back your files. You can download asoftech photo recovery which is one of the best photo recovery software
http://www.asoftech.com/apr/

I had success with this
1. Do not save any new file to memory card.
2. Connect the memory card to computer. You should see memory card shown as a drive letter (like H:) in My Computer.
3. Download a photo recovery software, recommended one is asoftech photo recovery (simply because i was using it and it worked)
http://www.facebook.com/pages/Asoftech-Photo-Recovery/126127714100611?sk=info
4. Install and open the photo recovery program, select your memory drive, and click 'Start' button to start scanning process which will find your deleted photos.

take out memory card from camera, and connect memory card to computer using a card reader, then use this camera recovery software named asoftech data recovery
http://www.asoftech.com/adr/

Try again with other software. If you are using a memory card, take no more pics until you've recovered the photos, take the card out of the camera. This is to reduce the chance of you overwriting some of your "lost" photos. There are many good freeware photo recovery software options that are available to help you recover your photos. This blog article reviews and outlines several of the better ones.
All the download links listed in the article are through CNET, primarily to verify that these are malware free software, and to give you a chance to read user reviews on the software before downloading.