Need help please pictures have disappeared

[specialspud78]

Hi hoping someone can help me. I noticed my phone was playing up when i was trying to post my photos to facebook it was not allowing me to. So i turned my phone off and switched it on again and then noticed when i went to gallery all the pictures i have took with my galaxy phone had disappeared and only the pictures from my blackberry which are stored on the sd card are showing. What has happened to my pictures and is there any way of retrieving them. I know very well i did not delete them. Also when i take pictures now they do not save to my sd card they save to camera. Many thanks