I've got to wonder if I have this too. For most of my life, I've felt like I'm operating at 60%. Every damn day is a constant battle with energy, and focus, and drive. I've been told its depression, anxiety, or ADHD. Prescribed medication, which I've always refused to take.
As a kid we were always playing in fields. My grandparents owned property in rural CA hills where we used to run around for days unsupervised, wading through tall grass with nothing but shorts and a T-Shirt on.
Did I get bit by a tick? Maybe? To my knowledge and memory, we never did find one on me... But then again, we weren't exactly checking every time we came in. I'm sure in all those years, I was bit by multiple bugs. Multiple times. Could that have injected persistent bacteria into my body that feed on my energy, and constantly drag me down?
Maybe it is just depression. But that sure feels like a symptom, and not a root cause. The root cause of all this is SOMETHING, and blanket diagnoses of ADHD and depression don't satisfy my need for an actual answer. With respect to medical practitioners, I still have to say, at times it feels like we're living in the stone age of medicine.