I'm currently experiencing an asthma exacerbation, for about 3 weeks now. I have been advised by my doctor to increase to a higher dose of preventer. I was denied oral steroids because my stats were fine and I wasn't wheezing, but I never wheeze. How long should I wait to see if the increased dose is going to help? Or should go back to my doctor? I'm using my reliever every day at least once, my peak flow is around 400 (usually 570)