Talk to Cardiologist on Sudden Pain In Heart Side

I was very fine and was sitting with my family at home and sudden I feel heavy pain in heart side,I was not able to even breath properly.Family took me to the hospital,in first ECG doctor comment was there is some variations and take one tablet of disperine, after taking disperine I was gone through with second ECG with gap of one hour.At this moment I was not having any pain.After reviewing the second ECG report doctor said it's normal.you can go home no need to worry.I have no any medical history ALHAMDULILALLAH, but once the same happened with me around 2.5 Years ago but that was too painful.kindly suggest what should I do?in routine life I am a happy person, age is 28, weight is 67kg with 5'6 height.