Singulair Nurses Office, Stomaches, Being a Boy, Sleeping Through the Night, Medical Reason

i'm glad that i found this site...thank you.
I have a seven year old boy and a four year old girl that have both been on singulair for a couple of years. The first year their allergies weren't that bad, so i didn't really make sure that they took it daily...the past year, allergies have been worse, so i was making sure that they took it daily and that they didn't miss a dose. My son was in 1st grade last year and by the end of fall, he was going to the nurses office daily for headaches and stomachs. Where his drawings used to be of flowers and all of us as a family, they started being of monsters. We also noticed that his pupils were dilated more than normal (you could barely see any of the colored part of his eyes) and took him to an eye doctor just to find out that his eyes were fine and there was no medical reason for the dilation. I also asked the doctor and the school to test for ADD/ADHD, with them saying that he didn't have it..At night, both my son and daughter started waking up for no apparent reason (they had both slept through the night since they were about 1) and being very scared for no reason. The mood changes have been more noticeable in my son, but like most, i chalked it up to "a phase" and just part of being a boy....my daughter got clingier and moodier, but i know how it is to be a girl, so i just took it with a grain of salt. My kids have not been on Singulair for approx. a week now, and my son is back to the boy i knew....skipping through the house and yard, catching bugs to just look at them and not pull them apart and kill them, sleeping through the night, no trips to the nurses, and eyes that seem to be normal again...my daughter is actually a pleasant little girl that can't wait til she see's her brother instead of pinching, hitting, and trying to hurt her brother........Long story short, since they've been off of singulair, i have my kids back. my son had circles under his eyes at times and a runny nose at times and we have to find something to help my daughters allergies (she gets eczema and is borderline asthmatic) but we will deal with that and find something that works without harming them.....
Thanks again.