I'm not at all trying to compete, just stating my situation as it is currently like you. I want to stress that I'm not doing anything but stating what's going on here and figured starting it's own tread would be ...hm, just depressing. Your situation is tough but, I'm going to assume that's really what comes with being a parent, I wouldn't know and never will but I will say that's unfortunate to hear all the same, I hope things get better for you.
I stay at home most(all) of the time to take care of my disabled mother who needs attention for panic attacks, to have food prepared for her, to make sure she doesn't injure herself. I basically go out when someone wants to grab food from somewhere or I'm needed to run a quick errand, even then I'm out no longer than an hour.
She once was a talented artist producing clay figurines by the dozens selling more than she could make, she also painted and took care of a lot of things in the house. Around 2007 we noticed her work looking odd randomly, 1 or 2 figures just looking ...off. She started to have trouble understanding how the lines in the street work. Years later we find out she has a rare form of aspasia (a rare thing to begin with).
Now she's barely capable of speaking, cannot recognize herself in the mirror (sees someone else and talks to said person), has trouble with many other things and basically it's only going to get worse. She wanders the halls at 4am sometimes confused where she is and often says she wants to go home, when she is. She asks about her parents who died, one of alzhimers (her father died of this, which makes this situation all the more difficult).
So I stay at home, take care of her, try and run a business my brother wanted to start up with me, I also clean the house and am in the process of looking for a job that can fit these hours, oh and my webcomic on the side. I would say what I do is hard but I imagine my mother who still has her mind about has it worse, unable to communicate, bouts of confusion, helplessness. All I can do is try and be there for her and make her happy.