Hey welcome and thanks for the post.
Having an alcoholic addict parent is very stressful.
It’s hard to comment as I don’t k ow you or your mum or the situation very well, what I can say is that none of this is your fault in any way, and you are also not responsible.
Quite often when you ha e an alcoholic or addict parent, the roles are reversed and you find you are parenting them. It’s natural to want to look after family, but you must make sure that you are OK.
Can you say what drugs?