It used to feel like a stabbing that went right through my chest and even through my back, usually less severe now. General aching and tight, heavy feeling in the centre or slughtly to the right of chest. Pretty sure its not stress, not the kind of person who gets stressed. The pain occurs randomly, after/during excersise, when im eating or whrn ive eaten, when im just talking to friends, or in the shower (litterally happens whenever.) what could it be? Should i be worried?