Help me recover from a huge mistake

I made an enormous mistake. I didn't make a copy of my database before making a macro change. I wanted to hide the Navigation Pane before I released the database for others to use. I went in and followed the instructions that were on Microsoft Office to select WindowsHide and when I reopened my database its all gone. Its just a giant grey screen. Nothing is there. I had already turned off the ribbon, so I can't even see that. I'm praying someone has a solution. I just finished everything. I'll have to rebuild the entire db. with all the data. I'm about to have a heart attack. Obviously, I'm a novice user, but I should have known better.