Anxiety can lead to a number of psychomotor symptoms and may or may not be the cause of your symptoms. Your description of the pain worsening when you push on it would suggest more of a musculoskeletal etiology. However, like you said, it is impossible to make an accurate diagnosis over the internet. However, having a negative cardiac work-up in the past is more reassuring that if these symptoms were experienced previously were not cardiac in origin. Other factors to evaluate or the presence of other risk factors you might have for having heart disease - hypertension, history of smoking, dyslipidemia, diabetes, and/or a family history of early heart attack.