Wine, allergies, and insomnia?

[Lil Ryan]

I popped open a 1998 Chardonnay last week (found it in the back of my stash). The bottle was certainly past its prime, but it was surprisingly drinkable. I usually get a bit pink with alcohol. However, that wine made me itchy and kept me up until 5am.

Any idea what would cause this, and -- if I indeed am allergic to alcohol -- what I should avoid (i.e. whites, older vintages) short of all alcoholic beverages?