Pudding, I may be reading too much into what you say, but my impression is that your husband is an alcoholic and has been one for years.
If that is the case he is not likely to change now, and certainly will only do so if he really wants to stop drinking. In that case he will need a lot of support.
Nothing you say suggests to me that he wants to change his behaviour, nor do I feel that you think your marriage is worth trying to save.
Can you prove that it was your earnings that paid off the mortgage? You don't mention whether you have joint accounts or separate accounts.
If I am reading your post aright and that your husband drinks, has no intention of trying to change that and that you feel your marriage is over, then my advice would be to work out what divorcing him will cost you. Even if you have to divide your savings, sell the house and divide the proceeds, if what is left is enough to live on, then I would say, get out, sooner than later.
There is only a year to go before you get your state pension and presumably if you are really badly off after a divorce there is some kind of social security to tide you over until you get your pension. Have you spoken to Citizens' Advice? If not, it might be worth a try.