DW has had monumental problems with asthma. The middle of March has typically found her going to the Urgent Care clinic for steroid shots and inhalers. This year was better. Two things helped. One was putting in a central filtration system in the house with an additional filtration system in her office. Both have HEPA filters and UV that burn up/break down organic materials. We also set the wash temperature to 135F to kill dust mites.
The second was hard, in comparison. In January she went on an Ideal Protein diet to lose weight and found that in addition to losing pounds she lost sneezes. Evidently eliminating all grains and beans (and also sugar and starchy veggies and much fat) did some good. Not sure if everyone would react the same way. Unless you are very fond of skinless chicken breast, roasted zucchini, and cabbage, the diet might seem difficult to follow. What I can say is that you don't have to feel hungry much. I lost a little weight on it, too; but I think I'm done with it even though I could stand to lose much, much more. In any case, even though it is not standard within the medical community to think that what you eat changes your allergic reactions, I have seen my allergic reactions change with diet.
I do hope everyone's allergies get better, nothing is scarier than having difficulty breathing.
