Thanks for sharing a little of your story on bb. I'm a 48 year old male who experiences intense emotions.
Alcohol lowers inhibitions, I surmise/guess that is the effect husband is looking for, as he sounds like he is inhibiting his feelings. So he might be drinking alone to release those feelings in what he (might) think is a safe place.
I have found that violently chopping wood was cathartic for releasing anger, rage and fury. These days society often poorly judges men who feel anger/fury, as if we aren't permitted those feelings, let alone permitted to do any actions upon them.
For me, I think aiming the anger/rage at something I can legally destroy/break, or aiming the anger at a perceived injustice and writing a letter really helps me cope.
We love our families so much that we will hide these "destructive" feelings away as much as possible, but isolation and repression aren't necessarily the best answer.
Maybe buy a tonne of unchopped wood and an axe and tell him "go for it, smash away!" might help, or something similar.