Hey nbw07,
It is difficult for anyone to make a diagnosis over the internet without examining the patient but I can give you some advice which may be of help.
From what you have described, the symptoms appear to be rather non specific, which means that the symptoms may not particularly be from the heart. However, that being said, if the doctor who examined your son felt that he should be seen by a pediatric cardiologist, he should be evaluated by one.
I would be particularly concerned if he has a history of a murmur. It is very possible that this is/ was a benign murmur of no major clinical significance but I think we should ensure that is indeed the case.
Children of your son's age grow rather quickly and anatomy changes accordingly.
I dont think that you are "jumping the gun." Even if the testing comes out all negative for a major cardiac problem, reassurance cannot hurt anyone.
Hope that helps
Thank you. I really don't feel it's heart related but I do think it's a good idea to rule it out. However, I don't want to waste the cardiologist's time (or the insurance co's $$) if there's no way anything could be wrong following a normal echo a year ago.
Thanks for answering my question and confirming the follow-up.