Hello! Welcome and thank you for asking on HCM! I understand your concern and would explain that your symptoms seem to be related to a metabolic disorder (thyroid gland dysfunction, adrenal gland dysfunction, etc). A carcinoid syndrome (related to a tumor which secretes serotonine) could be related to this clinical symptomatology too. Have you measured your blood pressure during these episodes? I recommend consulting with your GP for a careful physical examination, a resting ECG, a chest x ray study, an abdominal ultrasound and some blood lab tests: - complete blood count - serotonine plasma levels - thyroid hormone levels - cortisol plasma levels - kidney and liver function tests - blood electrolytes -fasting glucose , etc. The urinary levels of serotonin, 5-hydroxyindoleacetic acid [5-HIAA] and metanephrines are necessary to exclude possible carcinoid syndrome or a pheochromocytoma. Further tests may be needed to establish the diagnosis. I recommend discussing with your attending physician on the above mentioned possibilities. Hope to have been helpful! Best wishes, Dr. Iliri