I had a friend who developed allergy symptoms while in Florida.. Doc said it was from the coral dust in the air...
If it's constant I'd look for something environmental..
Dust mites in your home, do you sleep with an old pillow(more than a few years) every year your pillow add up to 10% of its weight from dead mites their progeny and their shit BTW.. cause of many many allergy symptoms... If you have asthma just doing this every few years helps..
might be time for a lot of guys to change their pillows unless you like the thought of your head layin in excrement and bugs every night
molds in your home?
you using BacWater or Sterile Water, maybe a Benzyl Alc. sesitivity?