Lucky, I didn't have such a spouse, but in several ways I was such a spouse.
Can you get him to your family physician? Or call the Doctor, explain the sitch and have the doctor intervene and call him in for a physical or some other pretense?
I, for one was delighted when I was diagnosed with Depression. Finally I knew what was wrong and I wasn't going crazy!
The meds worked so well. As did testosterone replacement therapy (a component, often, of depression).

Dr. should discuss the drinking, too. This is not good. 12-step or other program should be looked at. I chose Rational Recovery and it worked from day 1.

Gardener

"My soul, be satisfied with flowers,
With fruit, with weeds even; but gather them
In the one garden you may call your own."
Cyrano deBergerac