.xmp files but no pictures anymore in bridge

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Please help! I keep loosing my pictures. I do use all the most recent soft ware and have a new Imac so that would not be a problem.

I also use bridge and photoshop. Everytime when I want to go back to older pictures that I have adjusted through camera raw and sometime through Photoshop I end up having .xmp files but NO PICTURES. What's going on? 

[Lumigraphics]

More details? Where are these photos stored? Are they visible in the Finder? What version of Bridge and macOS?