Semi trucks symptoms and conditions

my 5 year old son has been taking singulair for reactive airway disease for just over a year. since he began taking the medicine, he has slowly become more and more distracted, irritable, moody, aggressive, anxiety ridden and clingy. the anxiety has been especially noticeable-he's developed odd phobias and fear of things like semi trucks and spiders and riding in the car. (things he never had a problem with before, and things that seem odd for a 5 year old to be worrying about) he also has had regular complaints of stomach pains (especially first thing in the morning), headaches and pain in his ears (which he has seen the doctor for on more than once occasion, and each time i've been told that there was no ear infection). he recently started kindergarten and his teacher has also noticed that he seems spacey and inattentive, as well as restless and "lost in his own world". due to the fact that there are several people on my husband's side of the family who have been diagnosed with ADD, we were beginning to feel that perhaps our son had it, too. we've been doing research and have spoken with his teacher and the school counselor about possible ADD, and just tonight we were sitting down and filling out an ADD checkpoint questionnaire for the school. i happened to glance at some of the reference material the school counselor sent to us along with the questionnaire, and i noticed that one of the points of reference for ADD diagnosis is that the person in question isn't on any "highly stimulating medications." it was right at that moment when i put two and two together and realized that our son's symptoms began right after he began taking singulair, so i came online to do a side effect web search, which is how i found this site. i can not believe how shocked i am to read all these other people's experiences with this medication!! i feel terrible that i've been making my son take something so questionable for so long, and i feel just as bad that i was about to seriously consider putting him on ADD medication!! now i am definitely going to try taking him off the singulair first and see if that changes his behavior! thank you all so much for sharing your stories. they really do help!