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The first place to start is by getting a free copy of each report here https://www.annualcreditreport.com/cra/index.jsp. Go over them carefully.
Post all the accounts you may have questions about. Some one will look at them and give adviced based on what they find.
You have to start somewhere at here is the best place for that.
I'm in a similar situation except I managed to keep the house and avoided bankruptcy. The trade off is I now have huge debt. I did this since I have a young son and wanted to keep as much the same as possible. Hard to believe that one woman could do enough damage to bring my net worth at age 57 to less than what it was at age 22.
I hope you have at least got your divorce done so that you know where you are and can start rebuilding.
My understanding is that bankruptcy should have damaged your credit far beyond 627 FICO. Are you sure that is correct?