Child Support Modification (Help Needed)

[mtk836]

Last year I received JOINT physical and legal custody of my 3 children. I made about 100k per year and even though we share them equally, I owe child support. Several issues caused me to lose my job one month after the case was settled. I remained unemployed for about 11 months and am finally back on my feet. Now I only make 45k per year $2200/mo take home, yet they will continue to take $650 per check / $1300 month. Her pay is up 10k p/y now. I find it hard to feed 3 children and pay my bills. She is living with fiancé at his house. (Missouri)

Does anyone know how to get child support modified? Can I do it myself? (She has a great attorney). How much will it cost? Can the division of Child Support office help me even if they represent her and her case?

Any help would be appreciated. By the way, she also received food stamps and additional aid from the state and used her parents address to falsify household income.

Thanks from Missouri