my granddaughter has been on singulair since she was 5 months old...

my granddaughter has been on singulair since she was 5 months old she is now 6yrs old and it does control her asthma, but lately i have noticed a lot of the symptoms posted here. Headache, stomach pains, nightmares, sleepwalking, and the episodes are getting more frequent. When she does this mostly at night it is scary to me especially when she is crying for help and you don't know how to help her. I was searching for something else and was brought to this site, like i was meant to see it and it really scared me. I have already called her doctor and got an appointment for tomorrow. I want her off this medicine as soon as possible.