I've never heard of the 3rd one you listed, but the other one that's available over the counter in the UK is chlorphenamine maleate (Piriton, and Boots do an own brand equivalent that's slightly cheaper) - available from pharmacies only. It's the only thing that works for me if I'm really suffering, and I haven't managed to get it here in Spain.
The worst time for me here is May when a lot of the trees are flowering, but it's flaring up a bit again now.
Plenty of places to order online, try getting it shipped to you?
I'd never even considered that. I assumed since Boots don't ship outside the UK, it was probably a pharmacy rule! I've just ordered 150 tablets from a site called Pharmacy Direct, so I'll see what happens.