Excel deleted tabs & data after saving file

Occasional Visitor

I have an Excel worksheet that has 3 tabs. After saving my work, when I go back into the file now I only have 1 tab and missing data. The data from tab #3 is now on tab #1. And much of the information that should be on tab #1 is missing. Tab 2 & 3 are completely gone. I am positive I saved my work because this happened before so now I am being very careful. There are no older versions of the file to recover. 

Thank you for any suggestions you may have. 

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