Alcohol intolerance is very common for ME/CFS. The last time I drank any significant amount I felt like I was dying of alcohol poisoning the next day. Very nauseous and sick feeling.
The anxiety makes me think of a chemical allergy. That's one of my symptoms with paint fumes, etc. The mucous makes me think of a food allergy. So maybe a little of both?
Have you noticed if different kinds of alcohol are better or worse? For example, beer vs. red wine vs. white wine, vs. whiskey, vs. vodka.
Have you noticed anything with varying amounts? Like a half a glass is ok, but anything more is bad, etc.
If it lasts for months, it sounds like you're having a terrible time detoxing. Have you noticed problems with other chemicals - paints, perfumes, cleaning products, etc?