Sulfites! I'd never heard of reacting to sulfites - and am not quite sure what they are Down for some reading.

No digestive issues, and no hives or scratching, just that I suddenly feel like I'm on the tail-end of a cold, the back of my throat and nose fills up. Gone after 20 minutes, so it's minor. I'll try with just plain olive oil as salad dressing for a week and see if that helps. No reaction at home (except once in a while a mild reaction to beer) but I don't drink much wine because it makes me very drowsy. Actually there might be something there.

As for the itchy thing - I once, and only once, got awful hives on my torso from something and spent an infuriated 2 or 3 weeks scratching myself, re-washing all my clothes in hypoallergenic washing powder, wearing just cotton, the lot. Gradually faded away and never came back.