Help, all photos are disappeared

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http://forums.androidcentral.com – Hi all, i have a problem: yesterday i realized that all the photos i made with the camera are disappeared, both from gallery and from DCIM folder that's empty. All the other pictures (screenshot, whatsapp, bluetooth) are still there. Unfortunately i didn't make a backup so i lost so many things.... :'( My Nexus is not rooted, it's exactly like Google made it. Please help me.... How could this happen? What can i do? (HowTos)