hi thank-you for providing the brief history of you. i feel you should start performing some simple exercises for improving the cardiac endurance and later strengthening exercises. As most of the times medications are symptomatic and helps only for time being. Also, more of the medication will lead to damage to kidneys so I feel the physician has stopped the medicine due to this factor. Also in my clinical practice most patients respond well to physical therapy and exercises. regards Jay Indravadan Patel