i take photos with my Galaxy S5 and they show in the preview but wont open in gallery.

I recently went on a cruise and took over 300 photos and videos and they all showed in the preview in the bottom corner as being there, now when i go to the gallery over half of them are black and wont open. Also i tried taking a photo just now and it show for a few seconds in the gallery and then changed right in front of my eyes to a gray screen with 1 line down the middle and now it wont open anymore.

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