Hello! Welcome and thank you for asking on HCM! I understand your concern and would explain that your symptoms may be related to orthostatic intolerance (orthostatic hypotension or postural tachycardia). Have you measured your blood pressure during these episodes? A head up tilt test is necessary to rule in/out this diagnosis. If these episodes occur only after eating, it may also related to post prandial hypotension (an autonomic reflex from the gastric distension). I recommend consulting with your GP for a careful physical examination, a resting ECG, a chest x ray study and some blood lab tests (besides the head up tilt test): -complete blood count (for chronic anemia) -fasting glucose -blood electrolytes. Hope to have been helpful! Feel free to ask any other questions, whenever you need! Best wishes, Dr. Iliri