I am so sorry for your news. My son was in surgery to remove his tumor for 6 hours, it was the LONGEST 6 hours of my life. We already knew his was cancer.
I know what you are going through. I also had a poor marriage that a year and a half later ended in divorce. It is hard when your husband is not the man he is supposed to be. Please pm me and I can send you my email if you would like and I would like to be a form of support for you if you need a friend.
God bless you Sweety and know I will be praying for you and your brother.