How to bring back SD CARD missing in File Manager?

My Iphone 5 was accidentally drop by my 9 months daughter in our bed. when my husband open it because he wanted to play games like POU, Candy Crush. It says application is not installed in your phone. When I check it. SD Card on the File Manager is Missing. So all our photos and videos save were missing to. Now, I wanted to know how to bring back the SD Card in the File Manager of my phone and retrieve all its contents. Please help me. I'm badly need the photos. Thank you