You may be on the road to burnout if:

• Every day is a bad day.
• Caring about your work or home life seems like a complete waste of energy.
• You’re exhausted all the time.
• The majority of your day is spent on tasks you find either dull or overwhelming.
• You feel like nothing you do makes a difference or is appreciated.

The Mind Tools website contains a very useful, online, informal self-test for Burnout.