If the lab reports and EKG is normal and you are using pain medications and the pain is not relieved by that you can have repeat EKG for some acute changes. If the EKG is again normal and you are not having any response to the pain you can have a cardiac scan for perfusion of the coronary arteries if that donot show any defect than there is nothing to worry about it may be due to inflamation of the connectins ribs and cartilages named as costochondritis
and that will repond to Ibuprofen
tablets twice a day for 01 week. You will be perfectly healthy after that.
I hope I am sucessful in solving your query If u have further you can ask me
Get well soon
Dr. Azhar Sattar