I’ve been feeling extremely tired all the time, even after a full night’s sleep. I wake up exhausted, with brain fog and poor focus. I struggle to concentrate on work, reading, or even short videos. My thinking, reasoning, and creativity feel impaired, and my productivity has dropped. I often wake with headaches, occasional bone pain, and have migraines and gas issues. Even small tasks feel overwhelming. My mood has been low and somewhat depressive. Blood tests (done end of August): B12, calcium, thyroid, liver, kidney, HbA1c, hemogram – all normal. Slightly low: Vitamin D 29.29 (ref 30–100), Serum iron 57.7 µg/dL (ref 60–180), WBC 3.6×10³/µL (ref 4–10×10³/µL). What could be causing this, and should I consult a general physician or a specialist (neurologist/endocrinologist/psychiatrist)?