-Try to sleep at night. You are more productive when you are well rested.
-Avoid drugs and alcohol.
-If able to, take a vacation or a PTO day to relax and recharge.
-Speak with a professional to work on stress reduction.
-Call a friend or family member to vent.
-Strive to balance your work and home life.
-Exercise. (I hear it releases endorphins. I'm still trying to find the time!)
Also, speak with management to work cohesively to prevent burnout before it gets the best of you.