Good luck figuring out the real cause in our modern medical system. I agree though, I think a more holistic approach would benefit most.
Psychiatry and psychology, in my experience, are both just a game of pin the tail on the condition -- simple, vague heuristics are used to diagnose conditions based on patient interviews.
I have ADHD, and during the diagnostic process, I never had a sleep study, any bloodwork drawn, scans, etc.. Could it have been something else? Not like I will ever know.
What's the old say that doctors commonly tote? "When you hear hoof beats, don't look for zebras when there are horses in the room."
It's so damaging because sometimes one needs to be looking for "zebras."
On the them I am motivated but cannot prioritize tasks to save my life