Sorry you're going thru this FA

I've lost my parents awhile ago now and witnessed this firsthand.
My mom was my dad's whole world, like seriously. He had tons of brothers and sisters, lots of people who he was friends with, me and my brother, (along with 4 other children but that's a whole nother story.....), but my mom was his world, best I can put it.
She was like 56 or something like that when she died of cancer, he was like 75 or something (yes big age diff). He was damn healthy at 75, still working a few hours a day, 7 days a week, looked way younger than his age and able to do everything he always could still.
After she died he just sorta lost the will to live I'd say. He became horribly depressed (understandably after losing someone) but this depression continued with him until the day he died, about 5 years later, while at work.
My brother and I would try to get him out of the house all the time to try to cheer him up. We tried to get him to go bowling (he bowled forever on a league), Red Wings games (think we even got playoff tickets), Tigers games, Lions games etc, all of which he watched on T.V. the whole time he was awake and not at work at this point, but he wouldn't go. Basically, the only place he would go to was this little restuarant a few blocks from the house 2x a day to eat and all he did was work a few hours in the A.M. and watch whatever sports that were on until it was time to sleep and repeat.
I know everyone says losing a child is the hardest/worst thing in the world but after seeing this and thinking about it, I think losing a SO, wife or husband or partner that you've spent a huge portion of your life with, would be worse, for me at least (biased because don't have kids though).
If it helps with your alcohol problems FA, send me all your booze; I GUESS I'll take one for the team and drink it, just for you ofc

...
On a serious note, the only thing you can really do is make him proud and live a long, healthy, fulfilling life until you meet again. That's what he would want.
Take care FA