She is very angry at me because she wants to go home and I'm out of excuses to try to get subjects changed and get her satisfied. She threating me that she is going to leave she cannot stay by herself and needs someone at all time with her 24/7 and sometimes I need a break.
I'm so exhausted and she doesn't want anyone but me and only me. If I leave her with my brother who tried to help but at the end when she back with me she gives me hell for leaving her with him her anger will last for days sometimes.
Her grandchildren even tried to help but she does the same to them too.
If I consider what I'd want my kid to do in your situation, the first thing that comes to mind is "calm me down!" Don't dope me up and forget about me, but do explore the drug options available, preferably with a geriatric psychiatrist or a doctor very experienced with dementia. I would not want to behave that way. If there is some means of correcting the imbalance in my brain to help me be more like me, I would want to try that.
Meanwhile, you have to do what you have to do. If that means sharing the responsibilities with other family members, then that is what you have to do, whether mom protests or not.