How hard for you all and a shitty time to be going through this stuff.
When I was 13 my beloved grandad died suddenly from cancer, my dad did not grieve at the time and chose to carry on regardless, all was fine for 6months or so and then he started to grieve and drink, he continued to drink, excessively and eventually the only description for him was an alcoholic. He the plummeted into depression (that will be the Gin!) and onto a complete mental breakdown, he literally sat in his chair and rocked.
My mum stood by him, it was a tough, tough time and went on for almost 2 years when mum eventually had enough, took him to the local mental health hospital and left him there, only for an hour and then went back and gave him a choice. He could stay there and she would divorce him or he came home and got help, proper help and we could remain a family.
He chose the latter and my parents celebrated their 40th wedding anniversary last year. My dad has not touched a single drop of alcohol in 25years and is the most amazing father and grandfather.
I honestly believe my mum did that for him and us.
It was tough, really really tough to have that all going on around us but I am so very grateful for the dad I have today.
My dad WANTED to get better, that is the key I believe, that and lots of support.
Only you can decide if you think your DH will keep to his word and get help, even if he does the drink really takes a hold and it will take a lot of work on his part to free himself of it's grasp, only then can he truly tackle the depression.
In my opinion anyway..
Good luck to you all...
Sorry, have just realised I have written war and peace!