Oh gosh, please don’t feel guilty. I was in a very similar situation with my Mum. People really underestimate how difficult it is to care for people with such difficult needs. Even with the help of carers (unreliable, very short visits, uncaring) it was unsustainable. With the support of social services we were lucky enough to find a lovely nursing home. The pressure went off and I got to visit Mum almost every day and enjoy being with her.
If you haven’t already done so get a POA in place which will make dealing with her affairs much easier.
I wish you and your mother well.
So sad I’ve nearly finished last Jilly Cooper
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