Hello! Thank your for your question on HCM! I would like to know if your dizziness is modulated by the body or head movements. It is necessary to perform a differential diagnosis of dizziness causes: - A brain lesion (like a ponto-cerebellary angle lesion) can be excluded by the performed MRI. - Low blood pressure. It is necessary to closely monitor your blood pressure during sitting and standing up position. A head up tilt test is necessary to exclude possible orthostatic hypotension. -An inner ear disorder. It may be the cause of acute dizziness and head spinning, exacerbated from the head movements. I recommend consulting an ENT specialist and performing labyrinthine tests, to exclude this possibility. -A vertebro-basilar insufficiency. It may be the cause of acute episodes of dizziness. I recommend performing a Doppler ultrasound of the neck vessels, to examine the blood flow in this arteries, and exclude possible stenosis. -Metabolic disorders. You should perform some blood lab tests like : a complete blood count for anemia, thyroid hormone levels, fasting glucose, blood electrolytes, kidney and liver function tests, to find out if there is any possible metabolic disorder, contributing to your symptomatology. You should discuss with your attending physician on the above mentioned possibilities and diagnostic tests. Hope to have been helpful! Best wishes, Dr. Aida