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I would suspect first, in the winter, mold/mildew -- including the foods list in link here. https://www.achooallergy.com/learning/mold-allergies-in-wint... . Tho, i'm sure you tested for that as well... hope you find the trigger.

I have also found that most typical minor "cold" symptoms for me stop immediately by taking Claritin D. I suspect its drying out things in the sinuses, and reducing some inflammation.

> Do you know against what you had the allergic reaction?

Not sure really, could be pollen, as in the morning my window used to open at around 6am and I would start sneezing or sudden change of weather - like If I would go out in sun and drink cold water I used to get cold. Messed up one crucial exam paper because of that :( . I wish I had discovered allegra before.

I have the same "cold" allergy. I can walk into a room that is 10 degrees F cooler than, say, "normal indoor temperature" and if my quads/thighs are uncovered (shorts, for ex.), I will immediately start sneezing.