No Job Claim

I pay child support and guys at my work ask if my child support has been lowered since she been working at Walmart and the local car wash. and i said no and the county does not know probably. and know she is double billing me thro the county for med expenses. and i just paid off 1 1/2 months thro the county. i need help the report said one of the girl is or was on meridia and trust me she was not over weight. i have not seen my kids in a long time. i thought it was the best for the kids and ex-wife now i am worried and wondering. and being cheated out of a lot i pay 150.00 a week approx.