Hello! Welcome and thank you for asking on HCM! It is true that a low caloric diet can lead to low blood sugar causing a similar symptomatology. This is because your body needs more energy for your daily activities. From the other hand low blood pressure can cause such symptoms too. Have you measured your blood pressure during this episode? If the problem repeats, I would recommend consulting with your GP and performing some blood lab tests: - complete blood count - fasting glucose - blood electrolytes. I would also advise taking plenty of water and avoiding large meals. You should try eating more frequently during the day in small portions. Hope you will find this answer helpful! Best wishes, Dr. Iliri