You are not your job, you're not how much money you have in the bank. You are not the car you drive. You're not the contents of your wallet. You are not your fucking khakis. You are all singing, all dancing crap of the world.
But seriously… it sounds like you were letting the outside world define you. Maybe use the silence to try to define yourself from the inside out?
What do you want to fill the silence?
Along with rest, how much sleep are you getting. I kept up a similar pace for about 2 years before life commitments required scaling back. When I felt as you are describing I was not getting enough sleep.