is your dp suffering with depression as well, does he give you hell when he's had a drink? my dp had a huge drink problem a couple of years ago, he wasn't at the stage where he would get up and start drinking, he would go to work everyday and then start drinking from about 5pm, he was very agressive and very insecure i was having afairs with the milkman the postman and even the bin men.
i realised there was something deeper than just needing a drink, to him having a drink made him feel better but the truth is it made the whole situation worse, he got to the stage where he had suicidal thoughts and that was the point where i took over the situation, i managed to convince him that he needed to go to the doctors, but i knew he would go in and play down the whole situation so i made an appointment and then i phoned and spoke to the gp and explained the whole situation and my concerns that he was on a slipperly slope down, i also explained that he had lost his dad a year previous in a terrible accident, this is what i felt was the whole route of his problem. so as the partner i really feel for you it is not a nice situation to be in and i guess you really dreading on egg shells at the moment.
i think you need to work out weither there is a deeper situation as in is he depressed has something triggered it or is it just he is alcahol depentent if he's depressed then get him to the doctors but don't rely on him going in alone and explaining all, cause he won't men aren't very good at admitting a problem. if it is just purely alcahol based then aa would be the best port of call, it sounds like he knows he has a problem which is a huge 1st step, i would personally put all my feelings a side and if you really think that the pair of you can come out the other side then i would suggest that you have a real heart to heart, say you don't want to argue ,that you want to help, and if he doesn't get help then you will not be able to put up with him for much longer, make him realise how he is making you feel and what he is doing to his liver etc and then say if he is prepared to get help then you will go to aa with him.
we have now come out the other side, luckily the doctor put dp on anti depressive tablets and they worked and the drinking excesivly stopped, he still has a drink with his friends at the weekend but doesn't get him self into a state anymore. my best advise is you need to talk to him and make him listen, the only reason he will get shitty with you is because he knows what you are saying is right and he won't want to hear it, so keep on talking don't give up on him he really will need your help and it is a long road but so worth it when you get your old man back. good luck (sorry it was so long)