How Can I get control over my husband disability check?

My husband many years ago was diagnose with Paranoid Schizophrania and Bipolar. This is a mental disease where he talks to himself, see and say things that are not there, he becomes angry for no reason, accuses people of doing things to him and etc., The problem is when he was diagnose in 1999, and then got his disability, he was taking his medicines like he suppose to and seeing the doctors and therapist regularly. The thing is around 2006 up to now he has been in and out of the mental hospital for getting off his medicines, refusing to take it any longer. He controls his own disability check, and gives me some money out of it for some of the bills. I pay most of the bills myself.

The thing is his mind gets bad when he skips his meds, and he gets on the plane and goes to stay with his mama and family saying he wants his own life, and then returns home. He sets us back financially everytime spending it on plane rides, buying up things and giving his money away which is hurting our family. I talk with his therapist about this, who was surprise that I did not have control over my husband's money. He does this every 3 to 4 months leaving me and our daughter, and while he's gone everything is on me, and I struggle with all the bills. I was told to get control over his check because he is incompetent. How do I do this?