I suffer from similar issues with allergic asthma, which type of allergy and in which time of the year do you suffer more ?
When I was in my twenties I've gone through severe asthma episodes, due to exposure to such allergens and once you get inflamed it's really hard to reverse without proper treatment. So I eventually went on a treatment with corticoids and Symbicort and by avoiding the problematic allergens I've been fairly well under control ever since, haven't needed any treatment for years. Before that I was using Ventolin, which wasn't working well and gave me tachycardia episodes, thank god treatment for asthmatics got better.
But I remained fairly sensitive to colds, many colds I catch evolve into bronchitis.