Iphone pictures deleted and replaced with my son s photos and contacts?

My phone was plugged into the computer to charge. My son tried to download his music onto my ipod as a favor by clicking the button "sync" in his itunes library. Unwittingly he downloaded all of his pictures from his iphone onto my iphone and consequently deleted all of my pictures. My pictures were not previously uploaded to the computer and I would really appreciate some help in retrieving them if it at all possible.

Added (1). My son and I both have iphone 4

It seems there has been and iCloud issue here. Go to Settings>iCloud>Backup>Back up now.

Then wipe your phone. On reboot of the phone select 'Recover using iCloud account. Sign in on this account and then your phone will recover everything that was on the Cloud.

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