Relax, and don't worry so much about your health, cool, mate?
After all, you're Irish, a member of the Most Beautiful People in the World, and on top of that, A Princess!
So, you have it all, girl..!
-(A heart murmur
is 'Very Common' in children when born, and then through the years, while the body is developing, the problem gets 'fixed by itself'; and, most people that have it do not feel anything. In your 30's through your 40's, the problems is 'completely cured'.
It is an irregular blood flow through the heart and that makes a 'different sound' than in any part of your body, and that's all but remember what I said about the cure. And, don't worry, because seeing a heart specialist is a regular procedure, and doesn't mean something's wrong with you, because that 'murmur' Does Not Cause Any Harm to the Heart.
I know, we have a house full of M.D.'s...)-