You probably got tons of advice already, and from people who suffered from burnouts.

I too suffered a terrible burnout, which led to depression. First of all, get psychological help: go see a psychologist and a psychiatrist.

The psychiatrist will get you some meds to help get your head balanced in the short term. The psychologist will help you sort out emotional and stress problems in the short, medium and long term.

After getting better on the short term you'll be able to work out the areas in your life that need attention.

Hope you pull through. Burnouts are just horrendous, don't let yours become crippling depression.