Our expert says:
We can be perfectly sure that the chest pain you have been experiencing recently has nothing to do with your heart. It sounds like what we call a “chest wall syndrome” in other words the pain is coming from the structures of the chest wall such as cartilage, muscle etc.
“52% heart function” probably refers to what is called the ejection fraction, which is a way of measuring the contractility of the heart muscle. Normal is from about 45-70%, so 52% is within the normal range. Obviously I do not have all the information that I would like but it does not sound as though you had myocarditis.
Tiredness after a viral illness such as flu is a normal phenomenon and I very much doubt that it is anything to do with your heart.
Kind regards, JT
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