Hey Kat.
I am sorry you are in this situation...I do agree with the thought that your own mental health needs to come first here. You are doing a very noble and admirable thing by taking care of her, but she is putting you under a severe amount of undue stress that you aren't due by any means. It isn't fair to you.
Was your mother like this before the ministrokes? I am not very knowledgeable on the long term ramifications of strokes, but could that be a possibility for her shift in mood?
I wish I could give you more specifics on what to do, but you need to do what is right for you. You are doing an amazing thing by caring for your mother, but not at the sacrifice of yourself.
Please know I wish you my best, and I am keeping you in my prayers.
My best,
Harley