
What Causes Rapid And Irregular Palpitations, Nausea, Breathlessness And Light-headed Feeling?

I would explain as follows:
Detailed Answer:
Hello!
Welcome and thank you for asking on HCM!
I read carefully your question and would explain that it is quite difficult to define the exact nature of your palpitations as you have a complex medical history (cardiac ischemia, orthostatic intolerance).
Those palpitations may have been postural tachycardia, as well as atrial fibrillation, SVT,or a ventricular arrhythmia.
If those palpitations have been rare or absent in the past, it is quite difficult to be documented even by an ambulatory 24-48 hours ECG monitoring.
In such case only a prolonged monitoring with an event loop recorder could have a higher probability of detecting any arrhythmic events.
So if other associated symptoms like chest pain, repeated shortness of breath occurs again I would recommend to primary investigate an ischaemic cardiac disorder. A cardiac stress test and additional imaging tests like exercise cardiac ultrasound, a cardiac perfusion nuclear test would be helpful in addressing this issue.
Meanwhile you should continue a healthy lifestyle, diet and recommended therapy.
You should discuss with your doctor about the above issues.
Hope to have been helpful!
Best wishes!
Dr. Iliri

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