First, quit beating yourself up and blaming yourself or your husband for what happened to your mother. It is not your or your husband's fault. Your mother may have refused to go to a doctor no matter what you did, and she may never have followed doctor's advice. The doctors weren't going to see her or treat her because you wanted them to, she would have to go and agree to whatever treatment they recommended herself. I have a stubborn mother that you can talk to until you are blue in the face and she is going to do what she wants to do and she hates doctors. Your mother is a grown up and her own person, and you and your husband are not responsible for the fact that she did not get medical care. Plus, nothing even doctors did might have saved her, even if they did everything right, which you can't even guarantee they would have. My father's life would most likely have been saved with a simple chest X-ray. My father coughed for years, but because he had never smoked in his life the doctors told him it was allergies and never did a chest X-ray regardless of the fact that no allergy medicines ever stopped his cough and the fact that he went to the doctor every 2-3 months for check-ups because he had controlled kidney disease. He had lung cancer caused by second hand smoke (the guy who worked at the desk next to his for years, back when you could smoke in the office, was a pretty heavy smoker). They didn't catch it until it had progressed to the point that he only had a couple of months left. It is easy to slip into what ifs, or blame, but it doesn't do anyone any good. Your mother would not want you to blame yourself.
Second, right now you are an emotional basket case due to your mother's death. Now is not the time to make any decisions regarding your marriage. Plus, from what you posted, it looks to me like your husband resented your mother because he loves you. He wanted you to be treated as if you were the most important thing in the world, and that didn't happen. My Dad did not care much for my grandma for the same reason- she tended to be a bit self centered and sometimes did hurtful things because of it, and it did cause some stress in my family. He gets angry because he loves you so much and wants your family to treat you better. It probably drives him nuts when he sees you trying so hard with them, and they aren't treating you the way he thinks you deserve to be treated. He doesn't like to see you hurt. Frankly, and I am not trying to hurt you, but it sounds like you have issues because of the way you were treated growing up, and you are putting walls up or taking them out on your husband because you are insecure or afraid of getting hurt. I'm saying this because that is exactly what my Mom did to my Dad. If that is the case, you need to step back and think about it. Maybe get some counseling. I don't want to see you mess up a good thing because of your upbringing- luckily my Dad understood my mother and stood by her and gave her space when she lashed out. Really think about whether what you are doing right now is taking out your grief by lashing out at a husband who loves you and was trying to do what he thought was best for you.
My heart goes out to you for what you are going through. Please, don't make any decisions about your marriage until everything settles down. In a few months, if you still feel the same way, then maybe try some marriage counseling and think about whether you really want to stay in the marriage. Now is not the time to make any lasting decisions. I wish you and your family the best.
