First, what I have actually done so far:
My understanding is that for these things to really work, you need to begin regularly consuming them at least a month before allergy problems are expected.
Last month I began to put turmeric in my food. I don't even remember what the active ingredient to turmeric was supposed to be, but it might have been curcumin. This chemical has been shown to reduce swelling. And that seems to be what I am experiencing. I have no swelling in my eyes or nose thus far.
I have put turmeric on eggs, toast, sushi and Kentucky Fried Chicken. I am treating it as a medicine, rather than a food, but I cannot say the taste has been offensive at all. Perhaps just a mismatch.
I am not using a phoney surgical mask (and never have) nor even the sponge nose filters I created three years ago.
I also heard that certain chemicals in wasabi were good. And after reading about curing peanut allergies by consuming small amounts of peanuts, and how some allergic reactions are related to others, I began to eat a peanut and wasabi flavored cracker mix. I ate the mix from small packets, maybe one packet every two days. If the wasabi is real or just flavoring, I don't know. But one thing about the peanuts is that I intentionally stopped eating them years ago because of the smell. So I figured that may have had something to do with me developing this allergy that I did not have trouble with before. (only once when I first came to Japan my eye got swollen for rubbing it, then no troubles for over a decade).
I also heard that quercetin was good and was available in apple skins. So I started eating apples which I never really liked, and also started to eat the skins as even on the rare occasion I ate an apple, I peeled it first, being concerned about the sprays they put on them.
Later I read conflicting information about quercetin in apples. And so I started eating capers instead. But only did that once a few days ago when I noticed other people having allergy problems.
Another recommended chemical is selenium. This is found in sunflower seeds, flaxseeds and mushrooms (I assume the European variety). So far I have had only the mushrooms, very well washed and lightly cooked a few times over the past month.
On top of that, fresh garlic, chopped, on a dry cutting board using a dry knife, and left to sit for at least 20 minutes.
Which of these has had the most effect or any or why, I cannot say. I have not ruled out placebo effect.
However, I am guessing at this point its the turmeric. That said, I have recently found out that unscrupulous spice sellers lace turmeric with lead, so you might want to watch out for that, especially if you have any intention to give turmeric to children.
Okay, so that is what I have actually done so far. Next I will begin discussing what I did not do that I was planning to do.