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Have you completed cardiac evaluation? ECHOcardiogram
and HOLTER (24 hour event monitor) and/or TMT (exercise ECG) are necessary to exclude the role of the heart.
If there is no problem in the heart, the next step is to see the neurologist
. It may be a form of Epilepsy
(akinetic seizures / 'Petit mal') / hypersensitive carotids and so on.
Wishing speedy recovery