I can't see my pictures on my iPhone but I know they're there but where and how can I get them back?

I was seeing if I could turn on my iCloud Photo Library but it said my photos took up 7.32 GB. My photos stopped showing up in my camera roll 2 weeks ago and I had the same amount of pictures but it took up only 6 GB. I took a lot of pictures them checked to see how much space they took up and it said 7.45 GB. I came to the conclusion that my phones saving them I just don't have access to them. Where'd they go? Why can't I access them?

Try contacting apple and asking them what's wrong