I went through something similar last summer. Others have mention therapy and medication, both of which I second. Also, look into whether you have adrenal fatig

I went through something similar last summer. Others have mention therapy and medication, both of which I second. Also, look into whether you have adrenal fatigue. I had it and the cure has been to take several supplements, notably DHEA and rhodiola rosea. I was good about exercising even at the depths of my burnout, but I nonetheless still felt tired all the time. The dietary supplements have made a profound difference. I've never felt so energetic in my life (I'm in my mid forties).