re: Got a pounding headache from drinking a whiskey last night

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Your usual brand? If not, I’d suspect an allergy to something in the new variety.
Or you were already quite dehydrated before the alcohol kicked in, making it worse.f

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Allergy or enzyme changes. Age a factor in the latter.

All allergies require some kind of previous exposure. So it is only due to lack of education on allergies that it surprises people to suddenly come down with allergic reactions to stuff.

Both can be "age related". Changes over time to enzymatic systems of the body (think metabolism slowdown as we age and get that beer gut) or auto immune malfunction triggering the allergy could be the cause.

I get splitting headaches from a single draft beer. Bottled or canned is fine (not that canned draft stuff though, it hurts too). Liquor is no problem either, or was, chronic pancreatitis prevents me drinking now.