As per my understanding you are having left arm pain post CABG, also your body becomes stiff. Whenever a patient is having Left arm pain espically with history of CAD, the first thing is to rule out cardiac pathology. Immediately visit a cardiologist. He will carefully evaluate the current condition of the patient. Differentiate between cardiac causes and non cardiac cause of left arm pain. Non cardiac causes can be treated medically; in case of cardiac causes a detailed evaluation is needed. Some diagnostic test may also be done to know the exact cause and decide on the treatment. Consult a cardiologist. Hope our answer helps you. For cardiologists, visit this page, it may help - 10 Best Cardiologist in India.