Allergies can build up in ones system. Before it may have been a minor intolerance and my have not noticed but the more you are exposed the more pronounced it becomes. Also If the wine is a different year then before something new could have been blooming nearby the grapes and when processed the pollen for that plant got processed with it. That is what happened to my sister-in-law. She drank the same brand wine for years and they planted strawberries nearby the winery and she had a horrible reaction. Now to play it safe she drinks beer.