My 55 yr old spouse has Parkinson's dementia signs. How do I get POA if he refuses to sign one?

I have been caretaker 3 yrs now despite abuse. He has declined in health mentally and physically leaves me to do everything except allow me to pay bills or make any decisions on our behalf. Everything is in his name only and he;s had us living in deplorable conditions past 3 years now. His decision making skills are crazy thinking, bills being paid late if at all, and refuses to move as he is ok living is bug infested mold ridden places, this being our 2nd that are making me ill. I have mold allergy, permanent disabilities and no income. He is abusive mentally and physically last month slamming my hand in a door breaking my finger then refusing me transportation to dr to get it fixed, Threw me into a wall lined with mirrors landing me on top of storage bins hurting my back that has 9 herniated discs plus I have arthritis and fibromyalgia. This left me bruised and back out for days. I literally do everything for him except work his job he refuses to leave despite dr advising he retire and warning him it is time to put affairs in order that his condition is worsening, He is unable to do simple tasks, does opposite what he is asked to do, losing memory, won't take care of personal hygiene, just watches tv and sleeps when not at work. His driving is frightening. Our finances are a mess but all is in his name including bank account I am able to use under supervision by him but not allowed to run budget. he fights me on every request, calls me a gold-digger, a whore the c word a b word etc. I stayed with this man when his illness took a decline despite his abusive nature as I am only family willing to help care for him. I actually was headed for divorce court before all this happened. We lost our family home in 2010 due to his negligence, moved into his friends substandard rental house infested with mold, ceiling in living room leaking eventually caving in, sewer problems and infested after he tricked us into it to collect money from hubby due to his inability to cognitively see the bigger picture, Then hubby refused us to move for 8 months despite my being ill the while time. I was too ill to find us an apt so once again he found another bad place to live due to being lead to believe it a great unit. Bait and switch tactic used here and we moved in despite their refusal to let us see it first. Then have had problems trying to get another apt or out of this one it due to a judgement on hubbys credit from previous home-owner friend filing a false eviction on us and hubby admitting in court he owed man rent money that we did not.The house was rented to us illegally and city ready to condemn it because I called them to come inspect it. I was not on lease as owner knew I would not easily be duped as hubby could be. we ended up paying to make repairs to his home so we has place to stay. An eviction was made although we had moved a month previous to the court date. The house was rented to us illegally and city ready to condemn it. conditions worsened, due to termites and other insects plus mold. we had to move as we were sick all the time. Lost all our household items due to mold and hubby has us in same situation again. I need some kind of help so I can take care of the finances, decision making and his medical care. He refuses to give me POA fight me on every level and I am not well either. Have to watch hubby's every move as he is screwing up on every level. Lacks reasoning, forgets everything and is fine with way we live. says he's not affected, He is part of reason I keep getting parasites.He refuses the treatments for himself and doesn't help with the precautions to clear up the parasites in home. I treat it with pesticides but it takes all those things in place for success. I barely get rest now as I am always cleaning and doing everything without help. I need help now before he ruins us. His lack of sense with reality and his abusiveness could lead to my death if he keeps up these fits of rage I am a good person and care or I would not be here helping him..He says he doesn't need help yet is unable to care for himself. Wants to be left alone but doesn't know how to do things to be alone not is he willing to. Runs away to bed when I try to discuss anything with him even non serious stuff. Doesn't want to hear my voice speaking I am told. Yells and screams constantly, is suspicious of my every move, abusive to our pets.and rude to our neighbors friends etc. Help!!!!!