@geke Thank you for the insight, this does make some sense to me as I would often feel faint when they struck. Not always, my assumption was that blood was being directed to elsewhere in the body in response to a fear emotion but I was never entirely sure. The heavy leg symptom was quite often the last to subside, I would try to take a walk to clear the sensation and it usually seemed to work.
RE: But there’s nothing to be anxious about......