So I’ve had this problem on and off for a good few years now.... I get pains in my chest mainly left side and shortness of breath. Sometimes get dizzy and sweat. I have had bloods taken recently which came back normal and I’ve had a few ECG’S which they said were not abnormal but very fast. should I be worried that it’s serious or is this just anxiety the GP has never been concerned it’s serious but can I trust them?