The physiology and psychology of stress go hand-in-hand.
Keep track of how your stress level is affected by the quality and amount of sleep you get as well as by your eating habits, physical activity, and your hydration status. Note when your stress levels are through the roof and make time for rest. A few days off can sometimes stave off serious health problems and emotional burnout.
Long-term stress messes up your hormones. Simply put, you begin to develop pathological medical conditions, and your psychological health deteriorates as well.