An interesting experiment might be to try some hard liquor and see if it has the same effect. If it doesn't then it might be the hops or malt or whatever is in the brand of beer you drink rather than the alcohol itself.

Quite interesting at any rate and glad you found something that helped.

I don't have any experience with asthma but I just did a quick search on Youtube for it and the keto diet. Low carb/keto has cured a lot of my ills and you can see if there is any worthwhile information in this search.

https://www.youtube.com/results?search_query=asthma+keto

John