Hello! Your symptoms could be related to post- prandial hypotension. This disorder can be related to autonomic nervous system dysfunction. The changes in blood electrolytes can lead to cardiac arrhythmia, but they are not related to eating (symptoms occurring after eating are not explained by these changes). I would recommend consulting with your attending physician for a careful physical exam and some tests: - a resting ECG - a chest X ray study - a Head Up tilt test - some blood lab tests (complete blood count, fasting glucose, blood electrolytes). I would also recommend performing a fibro-gastroscopy if these symptoms persist or you have other gastro-intestinal symptoms to exclude possible hiatal hernia. Meanwhile, I would recommend avoid large meals, hypercaloric meals and try to eat more frequently during the day in small portions, in order to avoid distension of your stomach and blood sugar overload. Hope to have been helpful! Best wishes, Dr. Iliri