Lots of medication info here - some of which I've used, and some not. My current one is Neoclarityn 5mg which seems as good as any previous ones, however for me, none of them provides an actual "cure" for hayfever. I get hayfever very early from tree pollen, so a dry and windy spring is hell for me.
Some non-medication suggestions: 1) Don't use eyedrops. Interfering with the eye's natural defences makes matters far worse for me. 2) Don't rub eyes - easily said ha ha. 3) Try to avoid a drop in body temperature. For me this induces sneezing which brings on the histamine reaction very strongly. 4) A bit unpleasant - smear vaseline up your nostrils. This improves the natural "trapping" of dust and pollen. Two tips: look in the mirror after doing this
and also have your hanky ready if a sneeze is coming as vaseline will vastly assist the passage of anything "en route".
5) Find out if a pollen filter is available for your car, and of course don't drive with the windows open. 6) If suffering badly, I find that breathing a mist of water helps, so stand in a warm shower (if poss) or breathe in steam from a sink or even just a cup of hot water.
Hope this helps - but judging by the posts so far, different things work for different people.