Combination Inhalers with A Fib

I suffer from Paroxysmal A Fib and I also have asthma . For the past two years I have been using Flovent HFA and levalbuterol as the rescue inhaler. Sometimes when allergy season comes around sometimes I feel like I could use something a little more stronger. Recently went to a new pulmonologist and suggested Advair Diskus 500 . I am quite hesitant to try something new because I only get maybe 2 to 3 episodes of a fib a year . I would greatly appreciate it if anyone can share there experiences with combination inhalers ? Or are steroid inhalers better for people with a fib. Thank you all. Have a great weekend.