Lung problems

In Nov 05, I had by-pass surgery - (three grafts were done). During the
proceedure, the nerve controling the left diaphragm sustained enough damage
that a "sniff test" revealed that the diaphragm did not move when it should
have done. A sleep study revealed that I had periods of low oxygen levels in
my blood and I was placed on oxygen for sleeping. A complete pulmonary test
showed I had lost roughly 20% of my breathing capacity. In late 2006, I
moved from Prescott, AZ (5200 ft) to Santaquin, UT (5,000 ft). My last Dr.
in Prescott recommended that I move to a lower elevation. Santaquin isn't
much lower. My new Dr. recently had me redo the full pulmonary test which
has revealed a further reduction, about 10-15% depending on which set of
figures you read, of my breathing capacity. I am scheduled for a
consultation with my Dr. at the end of January to review the new test results.
I am expecting another recommendation to move to a lower elevation.

I have been sucking on a DHD Healthcare, Coach 2, but have not seen any
improvement. I've used a couple of different inhalers with disappointing
results. Is there anything else I can do to reverse this breathing capacity
loss?

What is the name of the condition I have? I see so many different lung
diseases and conditions in the various web sites, but I don't know the
medical term for my situation and don't know what I ought to be reading. Can
someone help?

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