Your father?s chest pain while walking (angina) suggests his heart muscle is not receiving enough oxygen, despite his current treatment. This is a critical warning sign that requires immediate evaluation by his cardiologist, potentially needing an ECG, Echo, or angiography. Please do not add any new Ayurvedic remedies on your own, as they can interact with his allopathic drugs. Continue his prescribed allopathic medications without interruption. I strongly advise consulting his cardiologist immediately to rule out blockages, and later consulting a certified Ayurvedic physician to safely coordinate integrative therapies. Do not ignore exertional chest pain.