Had some pain near heart for 3 seconds.

Hi doctor, I am male aged 23. From january I am having a little pain in right chest left chest and also below ribs. I used tablets for acidity before. Then i realised that my heart is beating 65bps when i am sitting.some times it raises to 90-100bpm when i am standing.So having some fears i went to hospital. There i got my BP checked it is 110/90 mecury level. Then after that i had ECG test.doctor said it is normal..and i asked him y i m having this pain. Then he asked me to get 2D echo test. I have attached a pic of 2D echo test. I used esomac-D 40mg and etizola beta 0.25mg for 30 days..that is till the end of february. From thwn i am not using any tablets doctor. Pains in chest got reduced a bit and heart beats are only some times racing. Today while i was resting on bed i felt some pain in the middle of two ribs..that is to the left bottom middle of ribs.it lasted for 3 seconds..when i checked my pulse it is normal. Is that heart attack doctor ??. Is there any risk or chances ??