I am a beer guy. I love all kinds of beer. I have had beers from all around the world. I have had the same thing happen to me. The headache laid me up for 24 hrs. I was told by a brewmaster that certain enzymes react with certain people to cause this. Old Speckled Hen did this to me. The brewer told me to take a spoonful of sugar before you drink to stop this. I guess sugar neutralizes the enzyme. I can see why people think this a migraine headache. It really hurts.