Hello SalC, I know and can feel how you and your husband are at the moment, unsure of who you can contact and trying to help him, whether it's him accepting the need for counselling or to overcome his denial and with an addiction drinking a bottle of scotch per night is not going to easy, unless he becomes short of finance.
Sometimes when a spouse/partner pursues this issue, the further the withdrawer pulls away and shuts down, making it more difficult to be able to share how you feel while nothing is comprehended.
Living separately as you are now maybe a good option and wonder whether you are able to separate your bank accounts.
My wife left me several times, when I was the manager and part owner of a family hotel, my wife's side, then manager of a large hotel, simply because I didn't spend enough time with her and the kids, but it goes deeper than that and much more to the story, but was also in denial, now I don't drink at all and haven't for just over a year.
I just want to post this to connect with you, although I am about to log off, but will wait for you to reply when you can.
I had half typed a reply but had to go out, my apologies.
Take care.
Geoff.