Hello! Thank you for asking on HCM! I carefully passed through your question and would explain that your symptoms are caused by low blood pressure. I would recommend peforming further tests to investigate for the possible causes underlying low blood pressure: - complete blood count for anemia - thyroid hormone levels for possible thyroid dysfunction - kidney and liver function tests - blood electrolytes - cortisol and aldosteron plasma levels for possible adrenal gland dysfunction - a Head Up Tilt test for possible orthostatic intolerance. You should discuss with your doctor on the above tests. Meanwhile, I recommend increase the amount of salt you take with food and take plenty of fluids to remain well hydrated. Increasing caffeine intake would also be useful. Hope to have been helpful! Kind regards, Dr. Iliri