This suggests a few possibilities.
Hemochromatosis--- more common than doctors think;
Hemochromatosis.org - An Education Website for Hemochromatosis and Too Much Iron
Testing is not complex and should be offered to you to rule this out.
Polycythemia vera:
Polycythemia vera - Mayo Clinic
I think you should ask firmly for these to be eliminated/ruled out.
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All truths are easy to understand once they are discovered; the point is to discover them.-- Galileo Galilei
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Weezie looking at petunias 8.25.2017
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