Welcome to SR. We do understand what you are saying, feeling, thinking. Alcoholism and drug addiction are terrible. It does take away our loved ones. My son is also a drug addict. Homeless. Living in the next town. Couch surfing. Living in his car. He has given up his family, his son, his parents, grandmother, sister, everyone.....for his "new" family......all drug addicts and criminals.
The important thing is that we are here to get support from one another. To learn to live happy lives (yes it is possible) even though our loved ones are on a path of self destruction.
It's ok to be angry for a while......I just hope you don't stay there.
gentle hugs
ke