Cingulair symptoms and conditions

I am 47-year old, male. I started taking Singulair about 4 months ago to treat my allergy. I had very bad running nose and itchy eyes and was sneezing a lot. None of the antihistamines were effective. Amazingly Singulair has been very helpful. I stopped taking it few days ago thinking my allergy has gone as the season has gone. But everything is back. After reading these much about the side effects of Cingulair, I am scared that it might be dangerous to continue taking it. I have not experienced any bad effects, but don’t know to tolerate the allergy symptoms or keep taking Cingulair. Is there anyone who has had no bad experience with it after taking it for a long time? Please advise. Thanks.

I've been taking singulair for 3 years, and have had chronic diarrhea, some headaches, and stomach upset almost daily the whole time. Is there something else I could take that is as effective as cingulair for my asthma? My chest feels tight if I stop taking singulair. Becky