dear friend, instead take inhalor steroids in micro gram quantities regularly, you shall live better, with quality life and with near normal lung function. frequent oral steroids bursts is dangerous. consult your pulmonologist before you prescribe medicines for your self is all i can say. improperly treated asthma can become a COPD in future.
I have heard that there is something called short course of steroids for three to five days for severe asthma. It should be good. But continous use will definitely cayse side effects. so take care..