Help! I was just reorganizing my Lightroom folders and moving images and deleting the empty folders and now suddenly the 2015 folder with every single image I had from 2015 has disappeared in Lightroom, I still see the images under "all images" and I can still find their location on my computer but all of my folders in Lightroom have disappeared. How can I get them to show up?
You need to relocate the Image location in the Lightroom Catalog.
Please use the below link for the instructions.
Let us know if it helps.
If they show up under All Photographs, then right-click on one of them and select Go To Folder in Library to locate their folder location.
By the way, it sounds like you did something wrong while you were rearranging your folders.