Caregiver with no money and can't work. Any advice?

I am caregiver to my husband who has Parkinson's, dementia. I tried to work but he can't be left alone, every where I go to grocery shopping, beauty shop,paying bills, etc. He wants to be in the car when it moves. I could get someone to stay with him but he will not allow it. Our children work and not available, he will not go to anyone"s house to visit but for about 15 mins. and he is ready to go home.,If I will not get him something to drink like tonight, I was busy at the time, he tried to hit me, he goes to a mental health clinic and thought he was improving but at the snap of a finger he is raging. Any body else have a situation like this.