Thanks for posting on HCM,
What you experienced is a symptom that is medically termed palpitation
which could be caused by an underlying diseases/ heart diseases or could just be as a result of anxiety
or panic or physiologic with no apparent cause. Heart palpitations can be symptoms of illnesses such as coronary heart disease
, valvula heart diseases asthma
, or emphysema
But to me, I do not think after having just an episode of that, you should be too worried about it. Yes it is true that your heart abnormally functioned when you were driving, but i do not think you need to be alarmed as it happens to most people from time to time. In case of any recurrence. Please consult with a cardiologist for further review.
Thank you and best wishes.