@radder: Are the photos still visible in My Files > Images? Have you tried checking for a Gallery Update via the Galaxy Store > 3 lines in the top left > Updates? As advised above, check your Recycle Bin by opening the Gallery app > Tap the 3 lines in the bottom right > Recycle Bin to see if they've ended up here. I'd also recommend swiping up from your Home Screen > Google (folder), and checking the Photos app, as the photos may be backed up here.
and when you open the camera app, doe sit show the last taken pic in the left bottom corner? if it does, then check the details on it, there it will tell you the location of the file, probably all other pics.....if they are on the phone, will be there too. I would also restart the phone, just in case.