How do I deal with a stubborn Parkinson's patient?

My husband has middle stages of Parkinson's and has developed some paranoia, is short-tempered and not trusting. I have had to quit my job to just beat him into the car to drive him to wherever he wishes. He has a long history of sleep problems and is not sleeping ALL day and has taken himself off his medications. He refuses to go to lawyer to get a will and power of attorney drawn up for both of us. What can I do before he drives me insane? His mother died from Parkinson's and his father died with Alzheimer's. I fear that my husband may be developing some of the other symptoms as well.