Hi,
I had an abnormal ecg a few months ago. They were concerned and did more tests and discovered a congenital heart defect, and I ended up having surgery. After my surgery, they did another ecg and it still showed some abnormality, which they are not concerned about.
I just want you to know that they are experts - they know the difference between an abnormality that is just a quirk of someone's heart, and one that signals a problem. They would have investigated if yours was the latter. Don't worry!