your symptoms suggest of having high blood pressure
and rapid heart rate
that to on and off (paroxysmal) relates to pheocrmocytoma one of the cause for secondary hypertension
in young age , so once you consult your doctor and evaluate for secondary cause of hypertension .
And the hole in heart during childhood which was closed by itself means either ASD/VSD which does not cause these sympotoms usually.
Meanwhile you avoid strees and anxeity.