Cough induced asthma symptoms and conditions

my 6 year old has what doctor's have called cough-induced asthma or reactive airway disorder. He doesn't wheeze but gets these severe coughing spells which get worse at night. Usually comes on during the colder months. He is on Flovent, and Singulair to maintain When he gets the coughing spells, he gets the Albuterol inhaler 2 puffs every 4 hours. It makes him NUTS. Literally climbs the walls, Can't sit still. I'd rather have him cough than to see him like this. Now with the most recent coughing episode, I've noticed an extreme personality change. To the point where his 1st grade teacher called me to ask if it could be the medicine. He's normally a shy kid, sweet now all of a sudden he's a social butterfly in school and interrupting the teacher. AT home, he's just not right .Doctor changed him to Xopenex inhaler but he's still not right.