So upset!

I just tried to edit one sentence in my post about After by Amy Efaw and the entire post, which I have been working on for a week and was just about ready to upload is GONE. I hit Undo one too many times, I guess, and the post blanked completely out. Then the autosave feature came on and saved the blank page. I have tried using undo and redo, but there's nothing there in either direction. I am one very unhappy librarian. And I can't do any more research now on how I might be able to retrieve it because I have a program starting in ten minutes. If anyone reading this knows whether it's possible to get this post back, please let me know how to do it. (I tried to go into my history, but I had Firefox not to save history, so that doesn't seem to be an option.)