I have had on one occasion chest pains that lasted around 8 or 10 seconds I wasnt counting at the time. It was coming from the middle of my chest going towards and around my heart. I could not stand it was dragging me to the floor. I am 35 and I was taking medications for inflamation for my bunion and also before for my hands as the doctor says I have rhumatism but there is not tests that have been done to prove that yet. I dont take that medication anymore as I thought it was quite possible that the medication was at fault as I checked the side effects on the internet one of them was a heart attack. Dont I have a great doctor, here take these and the pain will go away but you might have a heart attack and die instead. So was that chest pain from stress or was it a mini heart attack?
I understand your worries. To me, "every agonizing chest pain should be considered of heart origin unless otherwise proved". First, rule out Heart cause by doing a simple ECG which is normal go for tread meal test (TMT), if that is normal to look for other causes such as peptic ulcer disease, HERD. If everything is alright then you may simply have anxiety disorder or panic attack.  Hope I have answered all of your questions. thanks