My mom can go from pleasant to argumentative in a moment's notice. It'll usually start with a simple statement or question from her which I'll respond to. This is an actual conversation we just had after laughing over a different topic 5 minutes ago:
MOM: I wonder if the boys are still working. (The boys are her grandsons that both have temporary jobs)
ME: They haven't worked for 2 weeks now.
MOM (angrily): I think I would know they go to work everyday.
The End. The lights turn off. Curtains close. No applause because the audience is befuddled as to how they bought a ticket to what started as a comedy but abruptly ended as a tragedy.
This makes me wonder if she knows her memory is bad. Are dementia patients aware of their condition?
Do people know they have dementia? Some do, some don't. Some know sometimes, but then forget. Some are like my mother and say their memory is bad, then say it's fine. There's no winning. All we can do is shrug our shoulders.
I suspect that most of the time, they do not understand that their memory is as bad as it is, because even if they realized it, they would shortly forget it.
Also here are two of the books I found helpful: Loving Someone Who Has Dementia, How to find hope while coping with stress and grief ISBN978-1-118-00229-2 and A caregiver's guide to Lewy Body Dementia (a more challenging form of a little known dementia) ISBN 978-1932603934
I'm sorry that you're experiencing these abrupt changes in temperature from warm to freezing when you're just trying to have an ordinary, pleasant conversation with your mother. It's a shock every time, no matter how much you think you're ready for it, and it's incredibly discouraging when it comes to keeping things light and "normal" (whatever normal is nowadays?).
But it's worse for her. Imagine not being able to keep a reliable grip on even the basics of family activity, and being only half-aware with it, and certain that you know something only to find out that you're 100% wrong... Even before I knew anyone with dementia personally, not being able to believe your own brain always struck me as the most disturbing and frightening thing imaginable.
I would suspect that when your mother freezes up - or snaps shut, you put it well - like this, it's because she's suddenly unsettled and reacts angrily to that feeling. It must be awful for you, too, a real kick on the shins. Maybe it would be best either to say nothing and squeeze her hand or make her a drink or whatever, or to change the subject to something reassuring - isn't the sky blue today, it'll soon be time for the news, we must give the boys a ring and see how they're doing. You want some way of restoring her grip gently.
Mind you. I wish I could promise that she won't just be angrier with you for being condescending - or "maddening" as my mother put it sometimes. But worth a try, I hope.
My mom now lives in a memory care facility and has no clue that she has dementia. I think its all part of their personal journey.
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