Oh I have TERRIBLE hayfever too, I was dreading being pregnant at this time as I get so sneezy and itchy eyes, runny nose, etc.
I've talked to a few doctors and chemists and such, and they've all told me to take Polaramine. It only works for 4hrs and it's one of the ones that can make u sleepy, but if u really need it, that's what I'd do! Also, if ur eyes look terrible, they have antihistamine eye drops called "Naphcon-a" (I think?) they work very well and come in a little red bottle, maybe just ask the chemist when u go in?
That's what I do Hun, hope I've helped! I know how nasty it is and how desperate u feel for relief, and I hope u get some!!!