This use to plague me, absolutely horrific when out doing anything outside. Streaming red eyes and nose so I feel your pain.
My solution was a 3 drug combo and I start it in early April before hayfever kicks in. You might be a bit late, but if you start now you should be OK.
RIght, basically, it can ruin your summer so:
1) Get to doctor ASAP
2) get a combo of decent stuff, not over the counter tat. If you've really got it, you need something good! FWIW I'm on Xyzal, Rhinocort (steroid nose spray) and Opticrom eye drops. Bascially a combo of those three elements will see you good. It is however very personal what does or does not work.
3) Get in a regime of taking them, and NEVER miss a dose, ever, until the season is out.
It's awful, it can make life extremely uncomfortable, but by doing the above early, I am totally symptom free. Wonderful!!! The not missing a dose thing is critical. I suffered so badly my first year in CH, much more so than at home, and it also affects my 5 year old horrifically (must be the fragile scottish gene's!). Wife doesn't suffer from it at all, so doesn't really 'get it'. Last year would stop giving the remedy to the boy when the symptoms went away, so of course afer a couple of days.... WHAM! We ended up in casualty as his eyes were so swollen and weapy they could not be opened. Poor wee boy!
So, find a combo, and stick with it/don;t miss a dose. I believe none of these things (esp the really effective eye drops and nose sprays) are for symptom relief, but acutally build up your resistance, so it might take a couple of days then you will be sorted.
The newer stuff also should be side effect free.
Kev