You need a lawyer. If you had no knowledge of the underlying divorce, you have a basis for having the entire divorce vacated. You cannot do this on your own. Hire a good attorney. There are many in your area.
You need to get a lawyer immediately. You were entitled to notice of the divorce under the law. He was supposed to have you served. You may be able to ave the whole divorce thrown out.
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I am less optimistic. The burden is on you to prove you were never served. It's called a 1401 petition to vacate, and depending who your judge it, it's either an uphill battle or a near impossible battle. It also requires due diligence on your part.
Why is this important? Because judge loses jurisdiction over marital estate 30 days after entry of judgment. So you won't be able to get "your share" of the assets, because the judge has already divided. And you can't undo that without an order vacating the judgment.
So at this stage, you need an attorney, yesterday.