Its not frightening.My dad had his first attack 12 years previous and he has in hosptal for a week.....even though he died twice.
When he got home he had to take it easy for 6 weeks then it was pretty much life as normal.all he had to do was eat sensibly ,stop smoking and pop back to the docs every now and then.
If you go,and they diagnose you with heart probs they will just treat it.The fact is, that if you dont go and the docs dont diagnose your prob, doesn't mean that you prob doesn't exist .You still have it.
I think you already know what you should do,your just to scared to go.Take a family member with you for support.
Now get down the docs !!