Jodie,
I am so sorry. Thank you for sharing this , about your brother. So young. That cocaine messes peoples heads up so badly.
Hopefully this message will help someone who may be on the same road. Good for you in starting Al-anon. That is a wonderful group/program. Lenina has some great suggestions there, which will help you too.
Take care of yourself, I am sure your brother would want that for you, and for this not to ruin your life.
hugs
chicory