It's not really clear what you did or where you are now in the process. More detail would be very helpful.
It seems like if you have the originals, and you have the catalog file (is that correct?), then re-importing is 100% the wrong thing to do. In that case, you place the originals in the EXACT SAME LOCATION (and they need to have the EXACT SAME FILENAMES) as before you deleted the master files, and that's it. If you do this, and then open Lightroom, everything should look fine.