Talk to Cardiologist on Chest Pain While Playing And Difficulty In Breathing

I usually play at home in backyard with my brothers .From last November I feel anxiety, feeling like my heart will stop .Chest pain while playing or doing some work along with difficulty in breathing. On November 24th I felt like having a heart attack though I didnot feel any pain it was anxiety and fainting My first ECG which was done at THQ had Borderline abnormal written on it but my on the same day I had another ECG and Eco test and reports were normal but still I think something is wrong with my heart .Is there any other test that can detect what's wrong with me I'm afraid of having a heart attack