I've been using fish oil every day, and it's helped my asthma more than
usual.  Have been in hospital ICU 6 years ago several times with severe
attacks.  I now have cats in the house.  Sugar-free diet, low carbs,
very little juice or soda, eat lots of fruits and vegetables.  For past
four years using advair and zyrtec and singulair which prevent Major
but not minor difficulties daily: ragweed still a major problem.  I
will see how the fish oil has or has no effect on the ragweed allergy.
Nasocort (triamcinolone acetonide) spray for post nasal drip almost
daily which caused the most problems dripping into my lungs.  Evening
primrose or flax oil, I've been told, will help: rotate with the fish
oil.  Also, fish oil if you don't get enough vitamin D which apparently
most of us do Not, if we don't spend ten minutes outdoors daily.
Exercise and water and teas to keep the circulation and flush the
allergens out of the air passages.
Grandmother in the 1930's ate large quantities of lettuce and drank a
tea made from an onion slice in a cup of boiling water.