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Yes I think that you should take him to the emergency now if his symptoms are severe.
I would not take any chances.
At his age the chances of any serious heart disease are very unlikely but a problem with the heart rhythm can happen.
One of the most common rhythm problems include supraventricular tachycardia.
Since he had breathing problem asthma should also be ruled out as well especially at his age.
Sharp pains in the chest are unlikely to be related to the heart but still would like that he should be evaluated in the A&E with a chest x ray and EKG at least.
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