Open each of the catalogs listed under File->Open Recent until you find the one with your photos
I did check there, there is no catalog or file that has my missing photo
Search all of your hard drives, using your operating system search feature, for any files whose name ends with .LRCAT
If you find such files, double-click on them to open them in Lightroom and see if they are the catalog file you are looking for
Thank you! That found the files.
When I talked with Adobe customer service, all they could tell me was to have Lightroom backup the files or will (clean out, or create a new catalog)? I was already backing up my files. I have had Lightroom for several years and this is the first time I have lost an entire catalog.