Not what you need, but staff at my mums sheltered accommodation warned me that a recognised side effect of Aricept type drugs is aggressive behaviour. I dont know how your health authority monitor tolerance, but if there is a problem you should mention it as it could be drug related. We are two weeks in and experiencing the reverse. My mum's improved orientation means she is more in control and therefore happier.
I am coming out of 4 months of full on involvement, sparked by a fall. I got home and essentially took to my bed for a week, stirring only to download on MN. I was physically and emotionally shattered. You don't want your life. I don't want your life either.
Not sure what I can say other than take satisfaction from what you can, eg you got through yesterday. And prioritise looking after yourself. Is there any respite support available: day care centre, neighbours, friends, family. A sibling living further away could come down for a few days and give you a break, or even post you a cheque so you can enjoy a with family treat or a girls night out. Something that takes you away for a bit and helps you see the wood for the trees. Or allows you to remember who you really are.
In terms of books, Hugh Marriott was my friend. His Selfish Pigs guide covered the ground pretty completely. On dementia, I am in two minds about Oliver James "Contented Dementia" but found it useful to accept that the demented person was in a different reality and it was easier for you to go to them, than them to come to you. One result is that your expectations of what they will achieve in your reality, eg taking pills, being there for appointments, etc are reduced, so less disappointment and the ability to take practical steps to solve problems without relying on the unreliable. It was also useful to identify short standard answers to the ever repeated questions, which were accepted and closed down the topic.
I hope today is better. Blue skies and sunshine here.