Thank you for all the good advice and information
@CANDC as it's all very helpful.

I certainly don't want to sacrifice myself, my physical and mental health, just to give care. Of course I care about this person, but I don't want their horrible condition/diagnosis to destroy me.
I suppose that's my very strong will to live and protect myself. It also sounds selfish, but I will have to be in order to survive this current reality I'm faced with.

Again, @CANDC thank you for listening. Take care