re your remark about having a support worker to take over for a few hours . I'm sure there will be voluntary group in your area who offer a "volunteer visiting scheme ".
If there is perhaps you could try and persuade your mum to let them come for an hour or two? As an excuse for them coming perhaps you could tell your mum that your doctor has told you quite firmly that you need some time to yourself on a regular basis because otherwise you are going to become ill!!
I know it's a big "porky pie" but something's got to give or you WILL be ill! And us carers have ALL told the odd "porky pie" to ensure our sanity! !
Hopefully (fingers and everything else crossed
In fact (light bulb moment!!) go and see her doctor and ask him to visit her for a "routine check up) and then ask him if he could kindly suggest this idea to her . I am sure most doctors would support you in this way.
I know my mum's doctor was always supporting of me when my mum was at home. Although saying that he couldnt persuade her to have day care or respite care!! But ANY THING is worth a try is it not??
Anyway good luck...all of us on this site are thinking of you.
Joan ((