Here's that link made clickable http://www.foodsmatter.com/allergy_intolerance/sulphites/articles/sulphates_sulphites.html
If you hit the box that says post reply instead of the quick reply box, the links become clickable and you can change fonts, colors, etc.
I found the website interesting, but I didn't find any credentials other than dietitian. And her recipes saying add onlin, garlic, leeks is just wrong! Those veggies contain lots of sulfite! I love them, but they make me sick. See provenance in Rick's book. He researches, measures and calculates this stuff. Nevertheless, I will read more of the website because it's got good points too. I always want verification before I swallow anyones theories.
Again, there is no sulfite in pure alcohol, so were you drinking wine or beer, or was there a citrus mixer involved in your reaction? Those drinks would have sulfite, and you could calculate from the amount you drank what your level of reactivity is. Of course you would have to add in any sulfite from food you ate, and your allergy could still be caused by something different. I get hives from the antibiotic Avelox, and get allergy symptoms from sunflower seeds.