My mother is angry person and dependent. No language or cognitive skills, I have been the parent since I was 5. How can I continue at 50+

Get a therapist. Maybe two.
What you could handle at 50 won’t be the same as when 60. Your best years are now. By 70 you will be slowing down and about the age of your mom when she moved in.
You are leaving very little time to get your own life in order for when you won’t be able to manage as well. And I’m not talking about finances.
And Minnie. Your mom is not happy. You have had seven years and by your own admission things have only gotten worse. She has so many physical issues, not to mention the mental ones. Why not let professionals care for her and you be a daughter and have some life of your own?
How YOU cope is important for both of you. Even if it’s just six months that you take for yourself and then you dive back in, consider it.
You appear to be very devoted to your mom. Consider that the both of you are worth a reboot for you. You are the leader. A good leader evaluates the situation and takes action. Wringing your hands isn’t the action you and mom need.
I am so glad you are looking for help. You need it and so does mom. Come here often for help. We will support you.

You moved her in with you 7 years ago.
Did you really think that her behavior would change with more company?
It didn't.
You correctly observe her behavior will get worse.
Yes, it will.
You say that you want her with you irregardless.
OK. That's fine with me.
As to how can you cope? I honestly can't imagine. I suspect in much the same way you have coped all along.

She will not change. Have you sat down and asked yourself what is your motivation for wanting her living with you? Is it fear, obligation, or guilt? Do you want to be a savior or a saint in the eyes of others? What do you get out of it? Seriously analyze these questions because this is your life at stake. There is no shame in allowing people who are paid and trained to handle difficult people to care for them. A loving mother wouldn’t want her child held in bondage like you are.