when did you last switch antihistamine? as im sure youre aware, they lose effectiveness over time and you have to switch to one of the other antihistamines for a few weeks/months before cycling back to the one youre on now
anyway claratine is a brand name, so youre not being terribly helpful. if i were you id go into your pharmacy and see what they have. id go for some sort of nasal spray with a sympathomimmetic in it (such as psuedoephedrine) to dry up your nose and an antihistaminic eyedrop to take away the itch
you also cant go too wrong buying some sort of saline (salty water) spray to flush out your eyes/nose of any collected allergic particles. saline is very cheap (a dollar or two) and can be very effective (im a fan of simple cheap solutions. it keeps my patients trusting me, so taht i can rip them off REALLY badly when the time is right...like right before i go on vacation and need cash

)