I have an Excel 2007 file,

I use it for my pool testing logs.
It's a monthly log, and I have started a new log for november. I cleared all the values and accidentally saved over Octobers log.

Is there anyway I can get this back?
I haven't closed excelet.
I can't use the undo feature for some reason. I see the downdown.
I used the developer tools to create some fill in boxes when i created this file.
When I use the undo feature is just puts a cursor in the box which was the last thing I cleared.

Is there any way I can skip that?