Unfortunately fatigue and pain can be long term sequelae of GBS. In one study more than 80% of patients had residual fatigue even years later.. There is no simple solution. There are a number of medications for pain management but they all can make the fatigue worse. Daily light exercise, starting with just a few minutes walking or biking and slowly increasing can reduce the impact of the fatigue. It is important to have your doctor check for other causes of fatigue such as anemia and low thyroid hormone. Sleep disturbance from sleep apnoea can also cause fatigue.