if someone you know is having a medical emergency of any sort, call 911. that's their job.
and also try to understand that your brother is living his live as he sees fit, however awfully he is doing it. you cannot possibly intervene 100% of the time. that stops you from living your own life. instead yours gets put on hold waiting for HIS next event.
for all your "help" and interventions to date, has it made one whit of difference....to him?
lastly, drinking while on anti anxiety meds is a recipe for disaster. the booze cancels out any positive effects from the meds, and the meds interact with the booze in a deadly combo.