This may be of interest to some of the forum members. I have never heard of this before, but found it while researching Hyperkinetic Heart.
Never self diagnose, if you have problems, see your Doctor to confirm that all is well. But for those that have been seen, and are known to have healthy hearts, yet have symptoms that persist, maybe the following will be of some use.
Neurocirculatory asthenia, (Asthenia is an abnormal loss of strength) from Wikipedia (and in abundance elsewhere)
"It has also been called effort syndrome, neurocirculatory asthenia, or "soldier's heart". It causes symptoms similar to heart disease - such as fatigue upon exertion, shortness of breath, palpitations, sweating and chest pain - but upon examination, nothing is found to be physically wrong with the patient."
In addition, from Wikipedia: "Related conditions
Some researchers have described similarities between orthostatic intolerance, chronic fatigue syndrome, mitral valve prolapse syndrome, and the observations of Da Costa (Neurocirculatory asthenia)."
From Wikipedia: "Treatment
The reports of DaCosta, and Wheeler show that patients recovered from the more severe symptoms when removed from the strenuous activity or sustained lifestyle that caused them. In many cases relapses were prevented by determining the limits of exertion and lifestyle and keeping within them. The limits were related to abnormalities in respiration and circulation. Other treatments evident from the previous studies were improving physique and posture, appropriate levels of exercise where possible, wearing loose clothing about the waist, and avoiding postural changes such as stooping, or lying on the left or right side, or the back in some cases, which relieved some of the palpitations and chest pains, and standing up slowly can prevent the faintness associated with postural or orthostatic hypotension in some cases."
Regards to all.