Get Plenty of Rest
Plan on sleeping and otherwise taking it easy for a few days. This shouldn't be hard to do considering fatigue is one of the main symptoms, so you won't feel like doing much other than lounging in bed or on the couch, anyway. Consider it a good excuse to take a needed break from the daily stresses of life. And if you absolutely must continue to work, at least get to bed earlier than usual and try to go into the office a little later in the morning.