This is common in a lot of types of dementia. My OH does not have PCA, but has trouble with all of the above. As he has progressed I have had to gradually take over all the things that he used to do. I started off helping him, then doing most of it with him helping and now I just do it. He can still (usually) make himself a cup of coffee and a sandwich, but he cant do anything else and even that is becoming harder for him. He was once a brilliant engineer and mathematician and to see him struggling to count backwards is so sad.
I have ended up doing the things that I used to do plus all the things that OH used to do plus looking after him, and there is simply not enough hours in the day, so I delegate what i can. I started off with a claener to do housework, then gardeners to keep the garden tidy and now I have carers to get him washed and dressed in the morning.