Last week, I experienced a dull stabbing/burning pain in my chest (left side but closer to the centre). It lasted for ten min and then subsided. The pain came back the next morning accompanied with shoulder pain after which I rushed to get an ECG and met my doctor. He said everything was fine and gave me antacid medication. Since then the pain keeps coming and going, usually around the same spot. Last night it felt like the pain and discomfort was there for over an.hour and this is worrying me. I'm still taking antacids. Are there any other tests I can do to determine the cause? The doctor said to see whether exercise brings on any pain but it didn't.