I, too, have felt "uncomfortable, sometimes even ill, when drinking small amounts of alcohol", depending, of course, what your definition of "small" is.
Hmm. I'm from neither of the cited groups but I too feel uncomfortable when a dinner host produces just a single bottle of wine which when divided among the guests is just enough for just one glass.
I've also experienced these feelings when I look into my liquor cabinet and see that I don't have enough for one full cocktail.