My 12 year old soon has been on singulair for approx 5 years. He ...

My 12 year old soon has been on singulair for approx 5 years. He has had severe anxiety, mood swings, stomach problems, and feelings of sadness when he is left; does not leave mom or dad for long. I started checking into the side effects of singulair a couple of months ago and found out my son was on double the dose for an 11 year old. We dropped him to 5mg from 10 and the stomach problems have definitely eased up. This does not help the fact that he has missed 15 days of school this year for mostly stomach problems, test and doctor visits. My new pediatrician assured me his asthma was under control due to the use of this medication. THIS IS NOT MEDICATION I honestly am feeling like it is POISON. My son has been on this rx so long I don't know how he would act without it. My concern now is going into puberty with this medication. We will not attempt that....GOOD LUCK TO ALL