Tiffany,
I wish I had some answers for you. I guess you probly know that predisone does help with a lot of CF problems, but it also drops your immune system down (that is what I have been told). I don't know how your cortisol level would be low, being on the predisone.
Isn't there any other things they could give you for asthma probems,,,, like add some antibiotics also. You probly already know that asthma flare-ups can be caused with infections and such.
I don't know really what to do to try to help you without knowing all the meds you take daily. Maybe you could write what else they are giving you.
I am soooooooo, sory you are having so many problems with asthma, and having to be on predisone for so long.....
Keep us in touch , okay. I'll be thinking of you, and hope somebody will have some answers to help you,,,,,,,,,,,,,,Karla