I was only ten years old when diagnosed, after fainting at a school sports day. Yet was able to have a long career in Aviation as a pilot. A Aviation Doctor once told me that pilots with a known heart disorder and being a treatable one, are far safer than those who fly with undiagnosed heart disease, as heart attacks are more common in those who have not being diagnosed than those who have. Every checkup used to send my blood pressure soaring (white coat disorder) and I tried everything to slow it down, I found walking slowly around the block, and refusing to think of the consequences if failed, helped a lot. There are pilots flying after by pass surgery, who are considered healthy, so as the others suggest, get your self totally checked out, and remember that there are those who have gone before you and successfully kept working. Good luck.