It feels more like tiredness in the back of my eyes. More like burned out (but not), almost like extreme eye strain. It feels like something is missing, almost like lack of ATP. Physically I'm not tired, and I could go run a mile, and it would actually make me feel better for a little while. My body wants to move, and my legs are sometimes jittery, but my eyes feel tired. Is this what low cortisol, or low t3 feels like?