Greetings. Thank you for your question and welcome to HCM. I understand your concern. Yes, it could result from panic attacks/generalized anxiety disorder. You see, every type of anxiety, even fear (called situational anxiety, in medical terms), is characterized by a acutely high level of chatecholamines (adrenalin and noradrenalin) in the human organism. They have a lot of effects in the human body, increasing heart rate and blood pressure, among others. These attacks can also cause organic symptoms, with psychological etiology (cause), such as chest pain, shortness of breath, numbness of the limbs, etc. Now, adding that all cardiac tests came back normal, and that rhythm monitor is not showing anything wrong for several weeks, my opinion, also, is that these are panic attacks or anxiety attacks. These attacks do not have a known cause, but they certainly have known triggers, such as public performances, standing in crowded or lonely circumstances, entering in narrow passages or closed areas etc. However, this is not a disease, it is merely a disorder which severely affects the quality of life or work of the person experiencing it. Therefore, my recommendation would be for you to consult a psychiatrist and be treated with a sedative (benzodiazepines) and, if severely affecting your quality of life, an anti-psychotic drug (for the mood swings), to suppress, prevent, even minimize these attacks. Once the panic attack is treated, the cardiac symptoms are abolished. I hope I was helpful with my answer. Wish you a good health. Best regards, Dr. Meriton