There are so many factors to hay fever, different pollens will affect different people. One thing I learnt is to try and stay in the sun, the heat will keep the pollen up in the air, don't take shade under a tree. Evenings are worse, as the temperature drops, so does the pollen. You could try Vaseline up your hooter, the pollen is supposed to stick to it. Wrap around sunglasses should help with itchy eyes(this is my issue, not so much the sneezing). Certain years, some pollens will be stronger or weaker, hence sufferers feeling worse in some years. I had injections years ago. I had so many allergies that I was having about 9 shots a week, for several months. Half way through the course the doctor couldn't get the needle in my arm because the skin had toughened due to all the injections, he had to use the other arm. They did work though, I was free from symptoms for many years, but eventually the efficacy diminished. I put up with it now, too many side effects with the tablets.