Oxygen, no pun here. My neighbor does the allergy thing, and every evening and morning he does oxygen treatments for about 10 to 15 minutes. he says it cuts his daytime and nightime symptoms in half, and the meds take care of the rest. He found it out by accident about 15 yrs ago, and now he says his symptoms are getting less and less every yr.
Hope you get some relief.
Ride safe all.
Greg