Has anybody been able to make their inhalant allergies better by changing
their diet?

I don't mean, finding hidden food allergies and intolerances. And, I don't
mean by being on a weight-loss diet. Fasting makes allergies less severe,
so being on a weight-loss diet might also, somewhat.

But rather, and anti-inflammatory diet. Like the diet that helps people
with rheumatoid arthritis, which inflames joints - low in arachidonic acid,
low fat, with fish oil supplements. I'm not sure why low-fat would be
anti-inflammatory, but 2 possible reasons: long term, a low fat diet
decreases insulin levels (see
http://www.lightlink.com/lark/comparison.html ),
and lower insulin would mean that arachidonic acid
is less converted into inflammatory compounds. Also, a low fat diet makes
the blood less "sticky" so there is better circulation in small tiny blood
vessels, so inflammatory compounds are cleared away from the area better.

Arachidonic acid is found only in non-plant foods, so a strict vegetarian
diet has none of it. Or, one can limit arachidonic acid by keeping track of
the animals foods one eats. So, has anybody found that going vegan helped
their allergies?

I don't have typical allergy symptoms - no runny nose or sneezing - i get
sinus congestion, inflammation which doesn't involve infection so far as I
know.

http://www.lightlink.com/lark/nutr.html