You can sue or defend if he sues. You may also consider a legal malpractice case.

Generally, no. The terms of agreements usually do not require notice.

Yes. Consult with experienced personal injury attorneys in the state where this occurred. Also, report this to the county health department.

There are attorneys who specialize in taking on DSS.

Consult with experienced attorneys who represent candidates before the bar.

Use the Avvo search tool to find an attorney. https://www.avvo.com/find-a-lawyer

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Fight the lawsuit and see about mediation to negotiate the debt.

Yes you can sue. You may be entitled to attorney fees for such a lawsuit.

You can report this to the police, the divorce court and sue.

No you are not in trouble. The creditor must garnish the correct employer.