Jakki, what about a respite break for you and your mum, with mum in a care home for a week or two? I do appreciate, if I've understood this correctly, that you have opted, with family consultation, for a 'conserve mum's estate by looking after her ourselves'....so in a way, if you've already sold your house and taken early retirement on a reduced pension, is there any point in now 'blowing' your mum's money on residential care? (I am assuming that you will get 'paid back' for all that you've given up, by getting proportionate MORE of your mum's estate than your sisters! Anything else would be grossly unfair!) (Yes, I know it's about best care for your mum, but there is NO reason for you to be 'ripped off' by your sisters who have got you to do all the caring, much more cheaply than in a care home, and then they put their hands out for equal shares of your mum's estate when the time comes!)
Or would respite for you for a week or so not really crack the problem for you? Is it just 'more regular help' that you want? If so, then if your sister's won't give their time, will they give their money so you can buy in extra care-help for your mum, to give you the time out that you need? (Or take it from your mum's money of course, if that's possible??).
Apologies if I've misunderstood the financial set up, and that your mum would be eligible for LA-funded residential care anyway.
As for you 'not crying' maybe it's a case of your professional nurse's training kicking in automatically (otherwise nurses would be emotional wrecks I would imagine).or that, somewhere inside, you feel that if you started to cry, you might just never stop.....
Wishing you as well as can be - kind regards, Jenny