If you knew anything about how "diagnosis from specialist" works in practice you wouldn't dismiss self dismiss diagnosis so easily. "The specialist" usually spend a few hours at most on the diagnosis (if even that) while people who self diagnose live with the symptoms their whole life.

It would be such an easy world of you could go to a doctor and get answers but it's not the world we live in unless it's common cold (and even then a lot of doctors can't be bothered and prescribe antibiotics just in case).