Hello! Welcome and thank you for asking on HCM! I understand your concern, and would explain that your symptoms may be related to a metabolic disorder or a vitamin or electrolytes deficiency ( based on your medical history for celiac disease). I recommend consulting with your GP for a careful physical examination, a resting ECG, a chest x ray and some blood lab tests: - complete blood count (for chronic anemia) - kidney and liver function tests - ferritin and hemosiderine plasma levels - blood electrolytes - vitamine B12 plasma levels - thyroid hormone levels (an immunological disorder could lead to thyroid dysfunction and celiac disease as well). A head up tilt test may be needed to exclude a possible orthostatic hypotension. Meanwhile I would advise you to avoid straining physical activity and take plenty of fluids (water, juices), to avoid dehydration. Hope to have been of help! Best regards, Dr. Iliri