Singulair and amazingly

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 started Singulair in the spring of '05, when my pollen, dust and cat allergies were causing my asthma to really flare. It worked amazingly well, though I have not taken any other prescription asthma meds to compare it to. Then after a couple of months I started noticing the muscles in my legs feeling very tight. I started getting cramps when I went running, which never happened before. Then I got cramps in bed at night. One day, I squatted down to get something and the tight muscle in my quad made a popping sound and I couldn't get up without great pain. I went to the doctor and it turned out I had torn a muscle. I ended up having three months of physical therapy, and that muscle still hurts a little bit even now, nine months later. I never had bad muscle tightness or cramping before I went on Singulair. Also, I did notice myself becoming more irritable and angry--and so did my husband. I stopped taking it, and the cramps and anger went away. Of course, the congestion and asthma returned, but that's better than what was happening. Bad stuff!