I've suffered with hayfever for over 25 years and tried all treatments including steriod injections right across to homeopathy.
I will list in order of what really works (these are all drug free}:
medinose Its changed my life, I used this all of last summer and yes expensive but brilliant, my ds2 uses it aswell.
nasopure try not be scared off by the photo, it washes out all the pollen - thats why you don't get hayfever when it rains or by the beach - lots of good articles and other netipots but the nasopure is the most powerful
vasaline or balm smeared up nose and around eyelashes
plant spray (buy from garden centre £1.00) put on fine mist setting, fill with water and spray over self, furniture, clothes, hair, near windows, pets and others if necessary, I also buy small travel sprays and keep in the car/in handbag. The idea is to keep the air as damp as possible.
Last resort, have a shower, wash hair and change clothes