Thanks for your question. There are many different reasons why artthymias are triggered off and in your case it sounds like a stress/emotion related incident. While it would seen easy enough to put it down to this, its a little worrying if you have become compromised i.e. feinted and collapsed. In sports situations, we also worry about this turn of events, particularly if it a regular problem, is associated with chest pain, dizziness and light headedness, and if there is a family history. Causes for the collapse could be a structural change in heart, such as hypertrophic cardiomyopathy, or a rhythm abnormality such as brugada or wolf-parkinson white syndrome. These are only a couple and there are many other possibilities.
It would be useful if you could visit a physician for an initial clinical history/examination, followed by investigations including an ECG, echocardiogram, treadmill test or even a cardiac MRI. In some situations you might require 24 hour monitoring and blood tests for stress hormone responses.
As you can see there is no simple answer to your symptoms, other than please get it checked out!
I hope this helps.
BW
Dr Dinesh
