Hi Henry
I agree with Ken, I awoke in the early hours of the 29th March 2008 with chest pains thinking it was my hiatus playing up again, so after going through 4 packets of gaviscon tablets and no end of roll ups, I eventually called the out of hours Dr at 3.30 that afternoon.(Saturday)
he said to come into the hospital in town for a check up and put me on an ecg and as soon as he saw the results he sent for an ambulance, I had been walking around all day with a heart attack, am not saying you are having one though but it does show you how it can be mistaken for something else,
So I would get it checked ASAP.