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Just for balance and to reiterate that really the only thing to do is figure out which works best for you, I have switched back to citirizine after trying fexofenadine for about 6 weeks. I've been struggling with low mood for the past year or so and belatedly realised that a real escalation in depression symptoms had coincided with allevia. Back to citirizine and symptoms and mood are much improved.
The thing I'd urge people to try is mometasone furoate, branded as clarinaze and available over the counter in larger bootses. It doesn't seem to be as popular as the two main nasal treatments but really made a significant difference for me.
i feel more/less spaced on some of them, though difficult to distinguish what is the anti-histamine and what the hayfever.
much improved since switching to fexofenadine, I dont know anyone who has tried fexofenadine and gone back to one of the others, it seems better all round (although a little more expensive). I occasionally supplement with a cetirizine (probably not medically recommended).