What he said - ditto from me! I don't know how I missed seeing that in your earlier post. I asked my wife [an M.D.] about your symptoms and she says it might be atrial fibriliation, a condition that - if left untreated - could potentially cause a stroke.
Actually, it's tachycardia (racing heart) what I'm told - which may be near about the same stuff.
Probably blockage and a cardiologist would have a hey-day with me.
I'm told its congenital. Mom had (but never told me). Dad has it and only recently told to whit I jumped in his craw about any other stuff I might need to know about.