well ,bro ! Take it easy, Firdt of all, do you have google account or facebook, or other backup apps? you can reocver data from google account and the facebook account can save your photos in its server, so you can recover photos from them. Secondly ,you have installed PC companion of the Samsung phone to your computer, right? Thus ,you can check the PC companion, maybe you can find some backup from the application, which will make a backup for your phone when you connect the phone to the computer. Lastly, if you do not have any backup, you can recover photos by some recovery software, such Recuva, which just can recover 60% data.Anyway you can try to use other one is better, know more here:
http://www.card-data-recovery.com/recover-photos-videos-from-samsung-galaxy.html