Hello, I keyed in on your comment "The inhaler helps when I use it. I wish it didn’t make me so jittery!" - Did they prescribe an albuterol inhaler? It is quite often the "first step" treatment for shortness of breath, and a lot of people resist using it because of the jitters, rapid heartbeat, or other unpleasant side effects. I too was one of those.
Quite a few years ago, a respiratory therapist who was treating my daughter suggested Xopenex (levalbuterol) which at that time was brand name only and quite expensive but we switched even though the copay was higher.

Thankfully, a few years ago a generic form became available, which seems to work just as well. Perhaps you could ask to try Levalbuterol and see if the effects are lessened.
Sue