from the lower dose (weakness, muscle/joint pain, nausea/vomiting, worsening of asthma symptoms), please contact your doctor immediately - she may want you to either stay at whatever dose you are on at that time for a
while or perhaps increase your dose slightly for a
while before resuming the tapering schedule.
Steroids, whether oral or inhaled, are a great medication for asthma (and other illnesses/diseases), but they also can have horrible side effects.