I feel for you.
I have sufferred for years and have tried them all.
I have found when living in climates with four distinct seasons that the following drugs help me immensely:
Telfast
Non-drowsy anti-histamine - I take the high dose once/24 hr tablet as I find the 12 hour not quite up to the task of round the clock relief. No side effects at all.
Albalon A Eyedrops
Itchy eyes - these are particularly good as they have three ways of helping.
1) decongestant
2) anti-histamine
3) lubricant
I have found these drops a godsend as they have an immediate anaesthetic quality providing instant relief from that "sand in your eyes" feeling.
Longer term, they leave a film on the eyeball protecting it from irritants like airborne pollens. This film can last as long as four hours (if you don't succumb and rub your eyes) before needing to apply more.
Not sure if they have any undesirable side-effects of note for an aviator. I am pretty sure they are safe, but you might have to ask your doctor just to be sure.
Hope this helps
