You probably chose your parents carelessly. A couple of my relatives can't drink red wine because it gives them horrible indigestion, whose symptoms include - but are not limited to - a fierce headache.
The problem has been investigated by a Australian biochemist (who happens to be the husband of one of my aunts). He found that one of the chemical present in red wine reacted adversely with one of the chemicals in the bile produced by the victims of this syndrome - presumably the victims have a single-nucleotide polymorphism in the gene that codes for the relevant component of the bile.
I'll have to get his e-mail adress from my mother or one of his family and see if I can get a refernce to the publication (which probably predates single-nucleotide polymorphisms).
-------------- Bill Sloman, Nijmegen