I can't address the medical (in)advisability of alcohol consumption in the cancer/chemo/post-op landscape, but I can say that every sip of alcohol I've had since starting chemo 2+ years ago (before and after Whipple) has taken a bigger toll on me than it did before.

Quicker to indigestion, intoxication, and headache... a price to pay almost every time. 🙁

I've never been a wine drinker, but the sweet, fruity, tropical and dessert-oriented drinks (daiquiris, pina coladas, mudslides) also hit me from the sugar perspective since my failing pancreas turned me diabetic.

As a beer lover, I've had to give up the larger glasses and bottles, usually sharing one with somebody else when I'm out. I've run across a couple good NA (no-alcohol) beers which, aside from being tasty enough, are sometimes available in smaller cans and bottles. Blue Moon NA wheat-style beer is one I like.

If they had a NA wine, I guess they would call that grape juice or Protestant Communion 😉
... but I don't think it would win many converts.