<s>[INST] Hi Doctor, I am 64 and have decided to gym. While I was under the direction of a trainer, I discovered that I had a slight pain in my head on the left side. Having visited my GP, he diagnosed a " heart stop?" He want to refer me to a Cardiologist, but decided afterwards that I should go for a second opinion. What do I make of this? [/INST] No idea. A heart rhythm disturbance is unlikely to be a source of head discomfort. Further, a minor rhythm disturbance with no symptoms may be no concern at all. The second opinion is a good choice. </s>