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The first step will be to see his cardiologist again - for a full re-evaluation of his cardiac status.
He needs to repeat the investigation like TMT (Stress
ECG) and ECHOcardiography
Hie medicines must be reviewed and revised if necessary.
If there is no problem / all well / it may be reactive depression
. He will improve with re-assurance / anti-depressant may help some.
Wishing speedy recovery