Pain under left breast. This new pain.

Hi. My name is Mounika. I am 28 years old. I have been experiencing chest pain in middle sometimes left of the chest sometimes along with left arm pain. The left arm pain almost stays all the day but the chest pain comes sometimes and lasts for seconds and goes away. I got ct angio two years ago and normal. I also done tmt and echo multiple times it's normal. Last three months ago also I got echo and tmt done which was normal. From a couple of weeks I have been experiencing pain under my left breast like upper abdomen left below breast. Sometimes it comes as pain last for seconds and goes most of the times it's pressure like. Something like a balloon filled i don't know how to express but it's less of a pain and more of a pressure. I am worried if it's cardiac. Should I get another tmt done or since three months ago it's normal can I be assured this is non cardiac. Please answer is my tmt valid three months ago or should I repeat because of this new pain.