You are very welcome, Gail.
The specialists to consult would be a neurologist and a clinical immunologist (rheumatologist). You would need following investigations;
1) MRI of the lower back to diagnose a condition called as neurological claudication. See the resource about it;
2) Antinuclear antibodies
3) Glycosylated hemoglobin
4) Other immunological panel.
These should be able to diagnose the cause of COPD (there is a condition called as interstitial fibrosis, if it has not already ruled out; the investigations will give clue to it also) and your other symptoms.
Please feel free for your follow up questions.
I would be happy to assist you further, if you need any more information.
Thanks for using Just Answer.
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