What happened to all the pictures on my Sony Cybershot DSC-W370 camera?

I have a Sony Cybershot DSC-W370 camera and I used it to take all of my pictures for my recent 5 week long vacation. When I got home I tried to download the pictures onto my computer, but they had disappeared. They did not show up on the camera. The strange part is I know they were on the camera before because I... show more I have a Sony Cybershot DSC-W370 camera and I used it to take all of my pictures for my recent 5 week long vacation. When I got home I tried to download the pictures onto my computer, but they had disappeared. They did not show up on the camera. The strange part is I know they were on the camera before because I went back and reviewed them on the camera. Does anyone know what happened and if I can retrieve them? Thanks for the help!
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