Hello Doctor . My dad has been ill for several weeks. His symptoms have been generalized edema , extreme fatigue and muscle/ joint pain, with severe pain in his shoulders arms and hands. A trip to his regular doctor and some tests revealed no answers. Although a trip to the ER two weeks ago revealed an irregular heart beat , Atrial Fibrillation . He was put on a blood thinner, Xeralto. He felt better after starting the blood thinner for only a week. He has a history of CAD, MI with PCI of RCA two years ago. A trip to his cardiologist was also unproductive. She stated that she didn t think it was his heart, that she has old ladies that live in this irregular rhythm. She has him doing an Nuclear Stress Test and Echocardiogram.