Hello! Thank you for asking on HCM! I read your question carefully and understand your concern. His symptoms don t seem to be cardiac related. But I recommend consulting with his attending physician for a careful examination, a resting ECG and a cardiac ultrasound, to examine better his cardiac function (based on the fact that he has suffered a heart attack in the past and has stopped taking all the medications). I also recommend performing a fibrogastroscopy (for his excessive burping, which may be related to a stomach disorder), and a routine blood test, Doppler ultrasound of the leg and neck vessels, kidney and liver function tests, blood electrolytes. I would also advise to closely monitor his blood pressure. Headaches are often caused by uncontrolled high blood pressure. Hope to have been of help! Greetings! Dr. Iliri