It sounds like your stresses are incrementally worse over time. I’m sorry to hear that, but perhaps the solution would be to go with all the “NOs” and see that someone else has responsibility for him. It may be kinder for everyone involved.
Dementia and Alzheimer’s are hard for families to understand and deal with. I’ve seen this in action and I know how difficult it is to deal with a parent who is physically OK but mentally is a stranger.
I will pray that you will have peace of mind and insight about his future.
My mom has dementia. If it weren’t for the trained caregivers I don’t know how we would deal. The one upside is that she is taking her lack of memory pretty well. Even when it first started she did not get angry about not being able to remember something.