Our mind & body are interconnected. Just as physical stress/ illness can affect us emotionally. Similarly mental stress can produce bodily symptoms as well. If your cardiologist has ruled out any cardiac reasons for your symptoms & if he thinks that it may be due to stress or anxiety, then visit a psychiatrist who after detailed history & evaluation will arrive at a diagnosis. If anxiety is found as the reason for your symptoms, then he will suggest relaxation techniques & ways to overcome stress & anxiety, which may include psychotherapy &/or medication.