Hey, Sorry to hear that.
Can you tell me, a few things, before I can try to help you recover:
> which phone are you using?
> when did you last sync your photographs
> Did you remove any of the photographs from the account?
> Are all the albums gone or are they there? I mean, can you see any albums or photos in All Photos sections?
Thanks for the help. I am using a Samsung Galaxy Note 5, however all photos are gone when I log on from my computer as well. I believe my phone syncs photos automatically, so probably within a week of the photos going missing. I rarely ever delete photos, the last time I removed a photo was probably over a month ago. All albums are gone, when I log in it gives me the option to add photos and albums as if it were a new account.