Had hay fever since I was a very young kid, probably 4 or 5. So 30 years now. Tried it all, even taking the tablets (multiple different types over the years) from way before the pollen appears and it’s all been a load of shite and not worked one bit for me.
Only things that have ever worked for me are Benadryl Plus (can’t seem to find these anymore) but these didn’t work all the time, and in the last 4 or so years the Tesco own decongestant liquid stuff (not a spray) - that stuff is fucking amazing. Doesn’t burn you nose after a few days of use like some other nose sprays do. I also have an inhaler for when it gets exceptionally bad on my chest and pretty much stops me breathing!
The comfort eye drops help, even better if you keep them in the fridge, but main thing is sunglasses when outside to stop some of the pollen getting in and to try your best to not itch!
Ultimately the best thing is aircon! I’ve actually gone and slept in my car with the aircon on many times before