I am getting to the point I may have to put Mom in a facility. Any advise, words of wisdom etc?

I feel like it's me or her and I cannot let her consume my life.

My mother is 91 and has blocked carotid arteries. I am starting to wonder if she has vascular dementia. She talks to herself and then says it wasn't her talking.She always thinks I am plotting to send her to a nursing home. She is completely deaf and I write everything down for her so she understand but she continues to talk negatively about me all of the time when I am the only family member taking care of her. I am getting annoyed by her accusations and demands for things. She doesn't ask politely for things, she just says "get me this or get me that". I feel a little courtesy and grattitude would go a long way. I have a full time career and I am taking care of her too. A little more background, until January 2016 she was living on her own, then she had surgery and I took her into my home as she could not live alone anymore. My siblings wanted to put her in a home. In any event, they don't check in on her, it's all on me. I would not mind and took her in because I didn't think she belonged in a home yet, but a year later I am wondering what I got myself into. I have no motivation, I don't exercise anymore. It's all about her and she says "it's owed to her". I am getting to the point I may have to put her in a facility because I feel like it's me or her and I cannot let her consume my life. Any advise, words of wisdom etc?