I've been on predisone in the past for asthma, but not for as long
as you have. "Moon face" is a well know side effect of long term
I think your question might be better suited in a forum related to asthma or respiratory issues, rather than a Weight Loss forum.
Hang in there, and check your email to see where this has been moved. I'll have Med Help put it in a place where you could get the answers you are looking for.