Family troubles are the worst

I know I am not responsible for my mom’s thoughts but this is proving a pretty hard one to let go of for me. We had a big fight at Christmas and I haven’t spoken to her since. She broke her leg and refused to see a doctor. I just felt I couldn’t live with that decision and that lifestyle choice (long story short). My brothers wouldn’t step in and I am not talking to them either. So yes I see that I am just hurting myself here but I don’t know how to create a boundary for this relationship. I want to call her but I don’t think I can control my emotions around her and I just get so angry. I know I just want to fix things for everyone, that’s who I am/was. But don’t I also have a responsibility here?
This has me truly stumped, I feel like I have hit a wall here and honestly don’t know how to get myself out of this. All I do is hurt myself and alienate my family and in the end I am always the bad guy.