Can't open and use my camera anymore!

Can't open and use my camera anymore!

Hi!
LG Nexus 5X user here.
Android 7.1.1
I have encountered a problem with my phone's camera.

The problem: When I open up my camera (Google Camera app), I get a black screen, only take a picture and switch between front and back camera buttons are displayed. Few seconds go by, I get a message: "Camera has stopped"

This all started last year in the summer when I installed Android Nougat. I managed to get it open then when I restarted my phone or cleared data. But since this year after few android security patches I can no longer open my camera.

So far I have tried:

clear Google Camera data and restart phone,
disable (restore to factory version) Google Camera and enable and update to new version,
factory reset,
and also tried other camera apps

but still nothing! Can't use my camera anymore.

But I'm also suspecting that the app might not be the problem. After trying other camera apps (which all gave the same message: "Camera has stopped") I'm starting to think that the camera itself is broken or something.

Bought the phone in June 2016 and have never dropped it.