I'm going through similar feelings right now and I tend to bounce in and out of this state every couple of years. I think the root of it is depression and anxiety. I would seek mental health care before you make a life altering choice. If you had the flu you would go to the doctor, you wouldn't wake up and say wow I'm so tired I should quit my job. Mental health is no different. Medication, therapy, and changes to your routine can help and often quite quickly.