color stipper question

I've been dying my hair light ash blonde for about 5 years now. For the past 3 months, I've let my medium brown roots grow. Two days ago, I used my regular color, Loreal les blondesmes extra light ashe blonde, and my roots went red. As soon as my hair was dry, I used another box, hoping to lighten the roots to match the rest of my hair. It then turned a hideous orange. So then this morning i tried yet a third box, and my roots are like a strawberry blonde now. My question is, how long do i have to wait to use a color stripper to lighten my roots? I don't want my hair to fall out or anything. Any suggestions would be most appreciated!