I've had a few visits to the cardiologist too. They should be able to tell after an echo-cg whether there is anything to worry about (as in my case). They can measure the width of sections of your heart and see any abnormalities by doing this. I still have to get my cardio to notify the CAA, but it should be fine. Remember, if there is a problem, you can always fly commercially on a Class 2 in the US, without having to do an ECG. There are other ways to a cockpit. Don't give up your on dreams. At times like this, you realise just how much you want to fly. I hope everything goes well for you in the future.