Thank you Gabe! Sounds like the "breathing test" I did was the same as the lung function test you described. I feel like I couldn't get out the needed air because I was in the thick of an hunger for breath "episode" as I call it. I feel these episodes happen for days (say 5-7) and then for MAYBE for 2 days it seems to ease up, then return randomly again. I might have forgot to mention, the pulmonary doctor I saw had me also take 2 kinds of inhalers alone with the oral lung steroid, which didn't provide relief as well.
And yes about the sleep study! I actually was a very sleepy child/student growing up (even with ADHD), and in my mid-twenties finally went for a sleep study because my sister also had one and was diagnosed with borderline narcolepsy. From the sleep study it was clear that I have hypersomnia and can fall into a deep sleep easily and quickly compared to others, and just overall sleepiness. The study didn't show any other type of sleep issues like sleep apnea besides excessive sleepiness (hypersomnia).
I honestly feel that my breathing is impacting my heart or the other way around and I really wish I could get down to the bottom of it. I had no issues with my breathing or heart before January. I am seeing another cardiologist in a few weeks thankfully for another opinion. I really hope to figure out what could be triggering this hunger for breath so I can go back to how I was a few months ago, I don't wish this feeling on anyone. Thank you again for your reply!