Advair HFA and personal trainer

First I would like to say that I know Advair helped save my life. I started it 2 years ago after respiratory failure from the flu and asthma. I was also on a course of Prednisone then and gained 20 lbs. Since my experience I eat better than ever (no fast food) and exercise regularly. I hired a personal trainer, joined Curves and walk several miles a week. I cannot lose weight! I began to suspect perhaps it's from Advair even though my Dr says it's not. I have not had an asthma attack in 2 years so I am going to attempt stop it on my own and see if that helps. I am very frustrated! I am also on Singulair and Proventil and hope these will ward off any attacks.