Hec symptoms and conditions

I am a 44 year old women that has been dealing with asthma almost my entire life on and off.But I started a new job(housecleaning)and I believe it started up my asthma.So after having to use my albuteral inhaler a couple times a day,I decided to see my dr.He put me on advair.The first day I started taking it I was breathing so much better.I thought this is it!I finally found the miracle pill!Well about 5 days or so into it I started getting a really bad sore throat.The kind that is deep down-maybe in your larynax or whatever.And yes-I rinsed really good after every use.Well I ended up in the e.r. at 12:00 at night.I could hardly swallow and it felt like something was stuck in my throat.They gave me an ekg and did a neck xray on me.Dr. told me it was most likely from advair and to stop using it now and he put me on prednisone for 5 days.I called my doctor that put me on it 2 days later and told him what happened.He said huh,I wonder why that happened?Anyways,now he prescribed singulair to me but after reading all the negative comments I am not sure what the hec to try?I have missed 3 days work.I will most likely change jobs.I am real weak and anxious.Probably from prednisone.Anyone have any ideas on what works best for asthma that has few side effects?HELP!