my 9 yr old son has been on singulair and advair for about a year...

my 9 yr old son has been on singulair and advair for about a year now. he has mood swings all the time. he gets so angry sometimes that he scares the heck out of me. i spoke to the doctor about this problem and he informed me that this was a side effect to the advair. i had no idea that this drug was not approved for children under the age of 12. he has acute asthma, and i`m afraid to take him off this medication.(his attacks hit him really,really hard) does anyone know of a possible alternative that i can mention to my doctor?