Pretty sure I am allergic to rye whisky. Guaranteed headache with just one. I do eat rye bread with no issues. I suffer from a lot of allergies in general and take otc allergy pills daily.
In the end I was getting sick every time I drank. Even just small amounts. Whether it was an allergy or internal processing issue I dunno. It was enough to pack it in. It affected my family, health. Time to go booze!