You are right!
I think you need to have some counselling first to help you put both your childhood and recent events into perspective. Then make decisions when you feel clearer. Quite a lot of us wont have had a storybook childhood, and I suspect our mothers in particular were moulded by their own upbringings in an era where opportunities for women were often quite limited.
Is your brother listed as alternate? If not it really would be better to give your brother and mother a chance to look at options before making a unilateral decision. Give them a couple of weeks? Suggest to your brother than he arranges for his solicitor to make a home visit and sort it out?
I have got comfort from the fact that despite some awful abuse from my mother when she was at her most vulnerable and insecure, and some "interesting" behaviour from others, I have somehow found a way through and my relationship is now better than it ever was. It would have been as easy to walk, and I would have been fully justified in doing so, but glad I did not.
The POA and accusations are real issue and one I fully understand. This is potentially a very difficult problem for me, as WBN knows. It is odd how the focus is on protecting the elderly person giving away the Powers. Signing up as Attorney without legal advice means that you are vulnerable to all sorts of accusations, and any "wrong doing" is potentially a criminal act. Given the level of emotion that dementia creates within families this is not good.
My mother's affairs have been quite complex, and as Attorney I really ought to be making decisions around property and investment. Make the wrong one though and I could be sued. Ideally decisions would be made after consultation with other Will beneficiaries so that I cannot be held liable should say, property prices rise and stock values fall, and the estate lose value. This though is not going to happen, indeed it feels like it suits other beneficiaries that the risk lies entirely with me. The alternative would be to seek legal advice on individual decisions that I might need to make. However OPG confirm that any advice I seek as Attorney has to be paid for by me and not by my mother. I am, not surprisingly, not keen to have legal expenses become part of our routine family budget.
For almost all legal documents you are required to take legal advice before signing. But not Attorney. This is an anomaly. No other members of my family wanted to be Attorney and had I known the implications I would have been in a far better position to have negotiated something that protected me and my family. Instead, and in mid-crisis, I signed because my mother needed an Attorney there and then.
That said if all WBN is doing is paying standard bills, and allowing her brother to make decisions, there should not be any urgency. Signing or "unsigning" should not be done in a hurry.
I hope you are enjoying the lack of involvement. If 24 hour care works, and does not require you to keep propping it up, then that is a result. The grief, anger etc will be natural. You have really been through the mill, every which way.