Deleted sheet

I think I may have made a catastrophic error!!!

I always copy a certain worksheet to a new book to analyze the data and delete columns so I don't have to save the information I don't want.

However, last night when opening the workbook, it asked if I wanted to update links and there has never been any links to outside workbooks.

What I found is that it is referencing Book2 (the book that was created when I moved the sheet to another workbook instead of copying it). I didn't save Book2. It still has the correct data that it is referencing as of yesterday.

Is there anyway to get the sheet back or find Book2 that it is referencing or is there a history file within excel?

thanks for any help,

Josh