Have you spoken to him about maybe getting on another type of steriod like prednisone?  I am currently taking it and I have never had any problems with it.  I took dexa when I was 15 and gained 60 lbs, but lost it all when I got onto the prednisone.  When I had to get back on it during my pregnancy, I experienced acne, moon face, and a rapid weight gain again.  I’m not sure about yaz, but I know that prednisone has been a good steriod for me and I have never had any problems with my weight on it.  In fact, I have had nothing but positive experiences.

I would definitely recommend trying to figure out a solution, rather than not treating yourself.  It is better to be on the safe side because who knows what may happen to you later on down the line if you do not take medicine now to treat the problems.  Hell you may grow a beard and that would not be good.