Hello! Welcome and thank you for asking on HCM! I understand your concern and would explain that your symptoms could be related to a cardiac arrhythmia, although it is not really typical at your age. Other possible causes to consider would be: coronary artery disease, panic attacks or a musculo skeletal pain. For this reason, I would recommend consulting with your attending physician for a careful physical exam and some tests to investigate for the possible causes: - a chest X ray study - a resting ECG and a cardiac ultrasound to examine your heart function and structure - an ambulatory 24-48 hours ECG monitoring to examine your heart rhythm trends during a prolonged time and investigate for possible cardiac arrhythmia - complete blood count for anemia - thyroid hormone levels for possible thyroid gland dysfunction - blood electrolytes for possible electrolyte imbalance - PCR and ESR for inflammation - a blood lipid profile. A cardiac stress test would also help exclude possible coronary artery disease, if suspicions are raised during the above tests. You should discuss with your doctor on the above issues. Hope to have been helpful! Kind regards, Dr. Iliri