I'm assuming your brother is legally an adult. Therefore he is responsible for the choices he makes. You have to take care of you. You can't help your brother and neither can your mom. He's going to do what he's going to do regardless of how much you put yourself out there. You can't do anything more for him than love him and pray for him. You CAN take care of yourself. It isn't always easy putting oneself first but you going to have to learn to. We are here for you. Call upon us and lean on us anytime you need to. Tell your family that you love them, HOWEVER, they have the luxury of making the choices they've made. You don't have that luxury and because of it, you have to deal with it and put all your energy into it. If you aren't good to yourself, you aren't any good for anyone else (I mean that lovingly, yet honestly)
"I'm going to get healthy or die trying"