Your situation is a difficult one. If the other driver has actually filed a lawsuit against you, you need to at least consult with an attorney. The cost for this consultation should either be very small or nothing at all. Once a lawyer has examined your paperwork and talked with you about the fact, he/she should be able to lay out your options and risks. Do this soon: there are time limits which will run without you knowing and it could put you in a bad place.
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