Hello! Thank you for asking on HCM! I read your question and understand your concern. Your symptoms seem to be caused by musculo-skeletic pain or anxiety. They don t seem to be related to any cardiac disorder and the fact that all your previous cardiac tests have resulted normal, is another argument in favor of an extra-cardiac cause. Is the stinging feeling modulated by body movements or breathing? A musculo-skeletic pain would be modulated from the respiratory movements. Does nexium make any changes to your condition? Have you tried any painkillers? I would not exclude a pinched thoracic nerve, which could mimic a similar clinical scenario. I recommend consulting with the neurologist for a a careful physical examination for neurological signs and performing a chest x-ray, a routine blood test and a cervico-thoracal spine x ray to exclude any other possible cause. If all the above mentioned tests result normal, anxiety would be the most probable diagnosis. Hope to have been helpful! Best wishes, Dr. Iliri