Refusing to go to the the doctor

I went to town today with DH. While at lunch, I mentioned going shopping while we're in the city Monday. He asked why we would be in the city. I told him he had an appointment with the brain doctor. He shook his head & said, "I'm not going." I said you promised the doctor you would come back in a year. He said, "I don't care, I'm not going." We went to the car & I drove in silence a little while. Finally, I said, "Why are you so against going?" He said there's nothing they can do. Nothing helps. He & I both stayed calm throughout the talk (yay!). I said, "We need to go to talk with them to see what we can do differently." He said there's nothing. When the time comes, take me out in freezing weather & leave me to die. I said, "That will never happen. This appointment is not just for you, it's for me. To help me help you. Don't you trust me? (Silence) I don't know what to do with you sometimes. You scare me. He laughs & says, Oh boy!" I said, "It's true! See? You don't see it, but everyone else does. I need help!" (Silence) We went in the store, conversation over.

He never wants to go to the doctor. Won't always take his meds. Majority of the time he thinks nothing is wrong with him.

Advice?