What should I do about my mother?

Last year, my mother was convicted of possession of crack. Turns out it had been an ongoing problem for years, which most of my family knew about, but I was kept in the dark. It really explains a lot of the neglect that my siblings and I went through, and a lot of the random fits of anger our mom would have. It never made sense until now. I've always felt sorry for her. I never knew why she was such an angry, bitter person. As such, I've kept my anger from her, I've never expressed it, always fearful of hurting her feelings. It seems that in exchange, all this internalized anger has affected me in negative ways. All these years later, is it worth confronting her about? I have no idea how to go about the situation, but I know that something has to be done, or else I'll carry this for the rest of my life- I worry that I will never become whole as a person if I can't move past this. Advice?