Advair HFA and even water

I am sure glad that I found this site. I am a 58 year old male, I have been using Advair 500/50 for about 3 years but; I did not know there were side effects with this drug. I have COPD with approximately 15% of lung capacity left. Before starting on the Advair twice a day, I could walk app. 100ft before I got so out of breath. now I am lucky to be able to walk 10 ft. and even then I must rest and catch my breath. I have gained an enormous amount of weight, and at first with a change to my diet I would lose a couple of pounds, but; that was also with my cardiac rehab. The cough is getting much worse and I cough so hard I feel like I am going to pass out. I am nauseated, have no real taste for food anymore. It is hard to swallow even water. I get a sore throat and a lot of mucous and it has become at times very hard for me to speak. I have to speak slowly trying to form my words so they can be understood. I also have a heart condition, and was having real bad palpatations. Why I didn't know, I was hospitalized and was put on Warfain and Solatol which does help. I never would have associated any of these side effects if I had not read them here in this site, thank you for alerting me. I am at a loss as what to do, I am going to contact a lawyer, but; I still do not know if I should stop taking the Advair.