What happens if i'm a regular drinker, why am i experiencing symptoms of "alcohol flush syndrome" or allergy?

Alcohol Flushing: Alcohol flushing syndrome usually appears in people of Asian descent who lack the alcohol dehydrogenase enzyme which then causes a buildup in formaldehyde when you drink which causes the flushing. In order to be allergic you have to have protein and there isn't much protein in alcohol. It could also be a sulfite reaction if it only occurs with red wine.