Hello! Thank you for asking on HCM! I understand your concern and would explain that his symptoms seem to be related to low blood pressure or orthostatic hypotension, probably related to the antihypertensive therapy that he is taking. Diabetic neuropathy could also lead to orthostatic intolerance. I recommend consulting with his attending physician for a careful physical examination and a head up tilt test for possible orthostatic intolerance. You should discuss with him the possibility of reducing the doses of the drugs that he is taking for hypertension. Meanwhile I recommend taking plenty of fluids (water, juices) to avoid dehydration. Hope to have been helpful! Best regards! Dr.Iliri