I have to agree with BMW6 here @Searchingforananswer2023. I am lucky enough to have a husband who both agreed to my DMum moving in with us (approximately 20 years ago), and he was there for me emotionally - he didn't do any of the pratical or care work, but I knew he wouldn't because that just isn't him, but me being able to off-load to him mentally really was a great boon to me - so already my experience was much better than yours OP. I also didn't have to go out to work, and couldn't have had my Mum live with us if I did, as my DM needed around the clock care as she was bedridden and had about middle stage dementia as well.
Anyway, I was not in good health myself when she moved in with us, but I had always promised my Mum in my head that she would never have to move into a nursing home, that I would look after her when, and if, she could no longer look after herself (I had worked in a nursing home many years earlier, when my children were still little, and could not stand the thought of her being in one - my DC were all adults by the time their Grandmother moved in with us, and only the youngest one, who is ND, still lived at home).
But although much of my childhood wasn't particularly happy, and that was mainly down to my Dad and his mental health issues, I was again, lucky enough, to have a lovely Mum, and when I was a mother myself to young children, my first husband left me, and my DM went way above and beyond anything a Mum of a healthy adult child would ever be expected to go. She made my next 4 years the happiest of my life (this isn't going to sound good, but the 4 years ended when I married my beloved DH - we have been married for over 30 years now).
So I had many years to know that I wanted to be there for my DM when ever she needed me. My health deteriorated quite rapidly after my wonderful Mum moved in, and after some months when my Mum's GP was visiting her, the doctor (female) said to me in private that I was looking increasingly unwell, so it was arranged for my Mum to have carers visit her several times a day to wash her and change her adult 'nappy'. I obviously still cooked her meals and brought them up to her, and washed her bedding and nighties, and changed her when she had passed a motion, as I wasn't going to let her stay in it until the carers came in. During most of the rest of the day I would sit beside her and watch TV with her, or chat, or sleep in the chair beside her if she was sleeping. At night I had a baby monitor in her room, and a bell.
Unfortunately, even with the carers coming every day, I continued to decline with my own health, until the time came when even my own GP (a male doctor from the same practice as my Mum's) told advised me that I couldn't shouldn't keep on looking after my DM (he used the crossed out words) as both the physical and mental load was still too much for me. I was devastated, but I knew he was right. I accompanied my Mum in the ambulance that took her to the nursing home - my DH and I had spent about 2 months calling in unexpectedly to all the nursing homes (it is a popular area for retirees), and we only found one that we thought was any good, well there was one that we considered the best suited to my Mum, but it was out in the countryside, and only privately funded, which sadly none of us could afford. That journey in the ambulance was the worst journey I have ever gone on, as my Mum said to me that she promised to be good if she could stay with us. Of course that broke my heart and I so wanted to get them to turn around and take us home, but my own health was getting really bad by then so we had to continue. My DH and I visited my Mum almost every day, spending at least for hours with her until she passed away.
I'm so sorry that this is so long OP, but I wanted you to realise that even someone who didn't work outside of the home, and certainly not 60 hours a week, and who had a Mum that very much deserved any sacrifices, which your mum unfortunately - for you - just doesn't, couldn't keep up with the stressors of looking after someone she really, really, wanted to! You have done your best OP, but now it is time to let the professionals take over. You never know, you might actually have the time and energy to not just get fucked, but to meet and have someone for you, to not only share the physical side of the relationship, but to be someone who actually puts you first, and is a loving companion, and "rock". You deserve a new happy beginning OP, I very much hope that you give yourself the opportunity to get that. 🩷 xx