Dangerous, stupid or what?

So my buddy and I have been thicc as hood thieves since we first realized we were both awesome at drinking. I then was best man in his wedding, we charted 40-80' ships through the Great Lakes, seen how many thumbtacks we can put into our own faces, saved me from being ganged up on in a party with mighty fists and it's been a wild 20 years of friendship. He's #2 at his company and must likely to own it soon. I've been out of work for almost 18 months.

I quit drinking last spring/summer for good and thank ya'll here for your support. I do get a beer when I visit and we go out but it's mostly for appearance. He drinks from wake to bed unless at work. I have been using uppers cause I like doing stuff and it beats depression which keeps me grounded on the couch. Last night I told him I wanted to see a doctor because I think there's got to be a legal medical way for me to "fill the gaps" of drugs. He was genuinely surprised and happpy to hear which made me believe he was hiding his feelings on smtg related. I told him if he has thoughts or opinions about my life and is afraid to say anything because you don't want my feelings hurt, I say a real friend especially speaks up on things that concern him about his friend and fuck his feelings, dead people don't feel. So, he meekly said he'd like to see if I'd try to quit my addictions cause he'd hire me in a heartbeat if I could. I'd be allowed to move into his home and I'd have work, home and a friend! (Currently living on the fam biz course where we have 4 homes and one was empty so I was asked to move back and take it over. But everyone hates me so I'm alone and miserable and I've tried since November to do right but no one cares)

So, it seems like a no brainer, yeah, quit all the shit forever no problem (I do get med marijuana for my back-if I could keep this for emergencies I think I'd be great) get this job and move in.

The fear is his amount of drinking. The fear of slowly going back... I think since I know my triggers now I can identify and seek help before it's too late but this is me covering my doubts...

Any advice or thoughts? Up til now, I've been on my own stuff so booze wasn't even a thing. Plus all my non-alky stuff never got dark, heh. Please, be honest and keep up the great work everyone!