What antihistamines do you use? Singulair was designed as an asthma drug but has been found to help some people with allergies. If you've never tried anything else, I doubt it will help you if it hasn't after 6 weeks. Have you tried zyrtec or maybe a nasal spray such as flonase or astelin?

I forgot to mention my dr. has me on flonase and astelin nasal sprays. They do help a little.