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I to went through the same thing some years back. I went back to school and got behind on child support. It ruined my credit when the attorney General for my state reported late payments on my credit reports. I still have the account on my report but it shows the true amount owed and it shows that it is paid on time now. The way I fixed the problem was to contact them and agree on an amount to pay on top of your child support towards the arrears. When I did that and made the payments on time it fixed my CR.
You just have to work this out in your state with the AG. By the way I was 10,000 in the hole at one point but got caught up. It can be done you just have to tackle it head on!
On a side note I made my last CS payment on the 1st of this month. My son is 18 and will graduate this year and my daughter is 20.