Singulair and environmental allergies

I have a 9 year old daughter that was sick on a monthly basis since she started school. We did the round of antibotics every month. Finally we went the route of having the tonsils out. That didn't seem to help the constant throat ,sinus drainage and constant barking coughing. Then we went through allergy testing discovered that she has no food allergies,but had a lot of environmental allergies and exercise induced asthma. The doctor prescribed Singulair in Feb of 06. My daughter has not been sick since. She has not been to the Doctor since Feb of 06. The cough has disappeared as well as the constant throat drainage. The medication has helped her symtoms,but now I am concerned as to what I am reading on this forum. She has not compalined about nightmares,or hallunications,but she has changed in her behavior some. She has become so confrontational with us. She at times does not have appropraite reactions to situations.She becomes easily angered and upset. She is a straight A student and has no problems with her behavior at school. Was recommended for the Excel program for gifted students.She does complain about joint discomfort l. She takes 5mg every day. I was wondering what mgs that others are taking that would cause all these horrible side effects? I am really scared to hear about the seizures. Of course her Doctor told us that the side effects were near to nothing almost like candy as he described it. I am worried about long term side effects. I did cut her dosage back to half during the summer months and she was fine.

Hi-
I have read most of the postings here and I too have taken my 3 year old daughter off of the Singulair after noticing similar side effects with her(bruising, nightmares, coughing). I do have a question-what medication if any have people switched to? My daughter has food allergies, some environmental allergies and mild asthma. I am looking into some natural treatments but would like to know what other alternatives there are.

Thank You!