My mom is going deaf and I am tired of yelling and repeating everything.?

I can't say anything because she also either has bipolar or early signs of dementia and will completely flip out like she does sometimes anyway. So I am afraid to buy her anything to help her hear or tell her nicely that she needs help. The only time I am able to tell her she needs to get help is when she has a temper tantrum and I tell her that is not normal behavior and she needs to get counseling. Then she storms off and either doesn't remember or ACTs like she doesn't remember anything ever happened. Does anyone know how I can handle this? I don't want to leave her with no one. My daughter and I are the only family she has and when I talk about us moving she doesn't want us to go by ourselves. I think it is really for another reason. She also has no friends cause she is a very bitter and crabby person. It is very difficult to be around her and when she picked up some heavy work out Equipment and threw it in front of my daughter and scared her I basically said that is it, she can be alone all her life I don't care but sometimes she is nice and I feel sorry for her, till she has another outburst. Please help. I hope no one says to just talk to her cause she was always harsh to me as a child and even though I know I can take her I feel terrible anxiety at the thought of any type of confrontation. Thank you in advance.