Been tapering from 40 last number was 30/25 when I started to feel achy. Been on 25 over a week and got a cold and my asthma kicked in. Also have headache which went away with aspirin. The question is should I take a blood test and if I do wouldn't it possibly be higher because of the cold? I do not want to mistake The high numbers for a relapse when it is my asthma and a bad cold. It has taken a very long time to get to 25 approximately nine months. And the prednisone has made me very sick. Can tapering at high number make you sickly nd weak?