I was going through my mac yesterday and trying to clean it up. I didn't think I moved or touched any lightroom files, but apparently I did something. When I launch lightroom all of my photos are gone. When I go to import files it says it's importing, but it won't import anything. It just keeps saying importing files.
Any idea what I might have done
First thing you should is ensure that you are opening the correct catalog.Refer the article Recover catalog and images after resetting preferences in Adobe Photoshop Lightroom to make sure.
While we are waiting for more information, it should be noted that importing a second time is always the wrong answer.