Hi my son jack is 6, he has chronic asthma, he is on inhalers and montelukast since the age of 3, his asthma nurse put his montelukast up from 4 mg to mg 6 months ago but I'm worried about his behaviour he's quite scary very violent and his tantrums start over silly things and last hours, I think it's not for a 6 yr old to behave like this, I need advice is anyone else having these problems