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When did the fatigue start?
Does he feel shortness of breath?
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I am waiting for your reply.
Does he feel pain in chest?
Did he get an examination by doctor after the development of those symptoms?
Easy fatigability is a symptom of aortic stenosis.
Blood can not be pumped out easily by heart.
There is pressure on the heart as the outlet gets narrowed.
There can develop complications like heart failure.
Tightness, dyspnea need to be investigated further.
There can be other factors too besides aortic stenosis like anemia.
I would suggest to take an examination by doctor again.
Repeat tests like echo, blood counts, metabolic profile would be helpful.
If there’s anything else I can do, please let me know