Can I get "re-fired?"

15 years ago I was terminated from company A for a minor misjudgment, and mistake on my part. Company A a huge company with multiple business units. I currently work for company B which company A just bought. The business unit is completely different than the unit I was in when terminated from company A 15 years ago. Nonetheless, this previous company has bought my current company. It's not like I was searching for my previous employer, it's purely coincidence. I'm so stresses out now as if the deal goes through, I feel like I'm going to get fired again as soon as they process my SSN#. ???????

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