Single mother non-custodial

I have been paying for counseling, child support and visitation for 7 years. My ex is the custodial parent. He was told to attend counseling and never did. Kept changing the rules and never got into any trouble from the courts even though he did not do what he was told. I have paid for everything possible until my business folded, I had to move back with my parents and I now I am behind in support. I have consistently paid what ever I could. I have a minimum wage job, support taken out, the court won't give me a public defender, I can't get the support reduced and I am told I will be sent to jail. He shows with any attorney and I can't get any help at all. What a joke!!