GERD or cardiac pain? Cardiac tests?

I am 41 and overweight. I also have GERD issues. Just a couple of days ago, I had a basic cardiac checkup done. The echocardiography and TMT results were normal. Today, I had a pain in the sternum region as I was climbing two flights of stairs. The pain went away almost immediately after I stopped climbing and rested for a few minutes. I did not get any pain when I again climbed two more flights of stairs. However, the pain returned about five minutes later as I was sitting, and has persisted for the last twenty minutes or so. The pain is sharp but not discomforting. This has also occurred in the past. The pain usually comes for some time and goes away. However, today was the first time I was concerned by how quickly it stopped on resting after climbing stairs. Should I consult the cardiologist again for more advanced cardiac tests?