please let us know the results
Alright, thanks for the reply I'll definitely press the matter.
I think getting the heart out the way for possible causes is an important first step. If the Cardiologist says that an echo isn't necessary due to your age, remind him of congenital defects.
I'll definitely get the cardiologist to do an echocardiogram, also I've found that my resting heart rate is something like 54.
Ask the cardiologist to perform an echocardiogram, this will eliminate the possibility of a congenital heart shunt from left to right :)
Has cyanosis been considered?