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Lack of focus can be due to the underlying hormonal problem like thyroid gland disorder --low thyroid hormone state.
Testosterone deficiency is another common problem at your age.
Vitamin B12 deficiency, iron deficiency also should be ruled out.
If your heart is ok, and no other problem found, then different medication like Concerta ( mrthylphenidate)can be tried at low dosage to improve your concentration.
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Yes that should be rechecked.
Relative polycythemia can be normal.
However if your red blood cell count is going up that will require further work up by a hematologist.