hypoxemic resp insufficiency

IThis weak a cath revealed cardiac outputs of 10. Coronaries and all else were normal.  Wedge pressure was low at 4.
I am severely dysneic on exertion, rarely at rest yet it has occurred and my pulse ox has shown 84% at the time.  I am using O2 at 2-3 l/min and it helps.

PFT's improved on xopenex, diffusions were normal, yet all meds made me feel worse: fortalin, advair, etc.  ABG's showed borderline 75-77 PaO2, rest normal. My pulm says I am not a real asthmatic but reactive secondary to Chron's disease that is now in remission and a demyelinating disease acting like R&R MS.  I am on copaxone and it has helped quiet neuromusc issues and uveitis.

Why am I so dyspneic?  Is it the high CO and hyoerdynaic heart?  What is the mechanism?  Thank you kindly.