Ex Husband is a "Nut Case" and deadbeat dad

I'm back...... Ok, its now 1 year after divorce. 2 years separated. The Ex Husband has not paid me child support for 7 months now. We have split custody. He is court ordered to pay $350.00 a month. He was also court ordered to pay health insurance on our child but closed the account with auto payments and I was forced to reinstate the payments with my own money. I also pay my childs dental insurance. So now the total is $400.00 a month which is relatively cheap in my opinion. But thats not all.... He was mentally and verbally abusive throughout the marriage and it continues to this day. I have saved some of his worst on my answering machine and will use it if I have to document his behavior in court. We have some serious disputes in regards to our childs upbringing. Our child went to a private school and I can no longer afford to send him there. So I have registered him at a public school. I informed the Ex if he wants him to continue there he will have to pay the entire tuition which his response was to sacrifice and find a way. I cannot afford it and he refuses to speak on a rational basis in regards to this issue. So my problem is with this "Nut Case" is: #1 - he will not pay child support. #2 - Is very difficult to deal with. #3 - Continues to make my life a nightmare when it comes to speaking with him. I wish I could have a calm and cooperative conversation with him but he is all over the board with insults and negative comments. He is mean and abusive. Oh, and he's an alcoholic to boot. But of course, he say's its all my fault. How typical I'm sure! Any help would be greatly appreciated. Thank you so much!