Jotting down a few ideas:
How about a psychiatrist does a blood test on, oh say, 10 different people who seem to have depression… chart symptoms of the same kind, check to see if blood levels are the same or similar, low or high blood pressure, regular pulse, etc? Maybe perform an MRI of the brain and monitor brain activity as the brain is triggered by happy thoughts and then sad thoughts…? What would be the difference (if any)? How about a thyroid check? Why isn’t there a way to measure dopamine and serotonin levels? How can we accurately treat these different neurotransmitters in people if there isn’t a current way to test for those transmitter levels?
Really, I’m not thinking anything new. Hasn’t anyone already thought of/done this?
It also strikes me that when it comes to treating mental illness, neurologists and psychiatrists need to function as one unit.