My brother and I have struggled with the effects of her drinking for many years now.
We’ve tried to help and of course that doesn’t work. We had a short period where she stopped and things were lovely but it didn’t last long.
I’ve been living at home as saved to buy a house which has been difficult but am now in the process of moving out and am considering cutting her off to save my mental health.
I know she will go into meltdown as she always says she doesn’t know what she would do without me and my brother hardly sees her. I’m worried something awful would happen and I would then have to live with the guilt. She has no life really and I feel like I need to be around but she just causes so much stress and misery 
It’s such a horrid situation, I don’t know what’s for the best