Hayfever usually acts up in late summer, and early fall. The known culprits are ragweed pollen, and mold. If your allergies act up in the spring , and you feel better after it rains, (rain washes pollen out of the air)than more than likely its pollen allergies. If your allergies act up on wet days, in moldy places, around wet leaves, are year round, and worse in the fall, then its mold. QBC, is the best natural antihistamine. Benedryl is still the strongest, but causes drowsiness. Allegra just came out over the counter. They also offer a generic form. Zyrtec, which is hydroxizine, and can cause drowsiness. The best way is to treat the cause.
For true hayfever, bio allers makes a new product, sublingual, to treat the actual cause. You may use at the same time as a natural anti histamine, or an over the counter one.
As well as for mold. https://hubpages.com/health/Is-it-a-cold-or-allerg...
Other recommendations include the following:
Keep windows shut, if its pollen. At your house, and in the car. Pollen is carried thru the air, and can settle everywhere. Ever have your shoes turn yellow, when you walk through the grass? pollen.
After being out doors, take a shower, change clothes, it also settles in the hair, and on clothes. You don't want to take that to bed with you.
A furnace filter specifically for pollen, should say on the package, will help to remove pollen, or mold from the house.
Your immune system is reacting to a protein in ragweed. The same protein is in cantalope, melons, and chamomile, best to avoid those foods, and herbs.
If your reactions are severe an immunoligist should be consulted.
I hear this year is suppose be pretty bad. As we really haven't had a good cold freeze. Global warming. Hope this helps.