I know you avoid caffeine. One thing that actually helps breathing is strong black coffee , you can do decaf. It helps open the bronchial tubes. I often just had to suck it up and take the steroids and increase my self care tenfold to help ward off a ugly mania.

Can you maybe switch from the Dulera to a old medication? Advair? or Symbicort? they have a smaller profile for inducing mania in general.

Hope you find a solution.