Sorry Lyn I have not read al your posts but have an idea of the overall situation. I am not in the same boat, but my Dad has AD and still lives at home, with all day carers plus my brother lives there, but this is not ideal as bro has mental illness so I have a degree of responsibility for them both. Mum died 20 years ago.
With Dad, I have come to the gradual, sad but unavoidable realisation that I have to protect myself from him/ his AD (it's always hard to tell where the boundaries are, what is the person and what is the illness). Dad's personality (which was never 100% easy, he's had a scary temper and beat me for much of my childhood) has been distorted by the AD so the paranoia, impulsiveness, demanding persona and tendency to anger can all flare up within seconds.
So i visit every fortnight, do the POA stuff, and pay big cheques for the carers. I am more or less at peace, I know deep down if I moved in with him/ he moved in here, the arrangement would break down probably sooner rather than later.
It is hard to accept that someone who was your parent, your protector is now completely changed and quite a different person has taken their place. But maybe you need to let go of who they were, look at it practically and put things in place so you can reclaim your life. Of course I can't tell you what to do, but that may well mean him going into residential care.