Here's a suggestion based on similar painful experience, which may not help you this time if you do not have a back-up of your good workbook, which is probably the case because you are posting this question.
I have Roxio Go Back on my computer (my OS is WXP), and I can't tell you how many times it's saved me. This is not the only Go Back product on the market, but it works for me and was a good investment. Here's a related url:
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