Hello! Thank you for asking on HCM! I read your question carefully and understand your concern. Your symptoms seem to be related to anxiety. Your family history for atrial fibrilation doesn t seem to be related to your symptomatology. Has anybody besides you noticed the skin discoloration of your limbs? You are too young for such cardiac disorders. Anyway, a metabolic disorder (like thyroid dysfunction, etc.) can not be excluded. I recommend consulting with your GP for a careful physical examination and a complete check up : - a resting ECG - a chest X ray study - blood lab tests : complete blood count, thyroid hormone levels, blood electrolytes, fasting glucose, kidney and liver function tests, cortisol plasma levels, etc. A treadmill test and an ambulatory 24-48 hours ECG monitoring may be necessary if suspicions of a cardiac arrhythmia are raised. If all the above tests result normal, the main cause of your symptoms would be just pure anxiety. In such case, I would recommend consulting with a specialist of this field to help you manage your anxiety. Hope to have been helpful! Best regards! Dr. Iliri