We're really sorry for all the trouble caused you. Do you know the location where you keep all the Lightroom catalog? Also, you can check the default location of Lightroom catalog which is C:\User\Picture folder
You can search your machine using .lrcat file extension and you should find all the catalogs which are saved on your machine.
Let us know if that helps.
Hi Steve - are you on windows or mac OS? Can you search on .lrcat and upload a screen shot of the folder contents? Are you opening Lr from the dock or taskbar?