I have NCed to give you this answer, but just wanted to give you the perspective of an ex-alcoholic. Like your DH, I knew I had a problem but didn't know how to deal with it. I thought I would die as an alcoholic, that there was no hope for me at all. I had a good job and a good life, but I could feel it all slipping away. Most people didn't realise quite how much I drank - I was very good at hiding it. i would normally drink at least a bottle of wine a night, and rarely had slurred speech or was obviously drunk. But it was ruining my life, and I knew I was dependent.
My DH knew there was a problem and tried to help me for years. I asked him for help and was desperate to change, but didn't think I could live without alcohol. We talked it through, we talked about ways to cut down, control drinking etc. The thing that worked for me was reading this book by Allen Carr. Just read some of the reviews on Amazon (mine is in there too). You might have heard of people who used this method to give up smoking. I can't comment on that, but for me, this book really helped me think through all the reasons I was dependent on alcohol and to let all that go. The nub of its argument is this: what does alcohol really do for you? Does it actually make you happier, more confident, more interesting, better able to cope, etc? Obviously, the answer is no. That might seem obvious to someone who is not dependent on alcohol but it is not so easy to believe if you'r trapped in the hell of addiction.
Crucially, this argument does not repeat the narrative of 'once an addict, always an addict', which I had always believed was true. I know this is what AA teaches and that approach definitely works for some people, but for me it just made me think, 'what the hell, I'm going to die an alcoholic in the gutter, I'm a weak human being and I can't function without drinking, I might as well drink ..' and everything just continued.
I haven't touched a drop for 6 years! Not coincidentally, I think, my career has gone from strength to strength and, most importantly, my relationship with DH has got better and better and better. We are much more equal now, and have just reached a milestone where I have been sober for more of our relationship than I was (a secret) drunk. For about a year after I stopped drinking I used to wake up and burst into tears of joy because it was such a relief to be free, and to not be hungover, and to be able to appreciate the beauty of the world! I never thought I could give up drinking, so actually managing to do it was a huge confidence boost as well.
I am eternally grateful to my DH for sticking by me, because I was pretty selfish and hid a lot from him. But I think he would agree that we have both benefitted hugely from my recovery. There is hope, it can get better, and your DH will be able to do it with your support. Alcohol is indeed a cruel mistress, but it can be overcome. Good luck to you and your DH.