Why am I missing pictures from my Nokia Lumia 928?

[Windows Central Question]

pictures gone from Nokia lumia 928

I just noticed today that my camera roll only appears to have pictures for a year...from 12-20-2013 to 12-14-2014. Does anyone know if this is a setting issue? I am devastated, I have lost irreplaceable pictures of my son that were transferred over from my iPhone so I know this hasn't always been an issue.