Hi, I just saw your video on Truth about Mental Illness and Disease. I wanted to let you know that there is a psychiatrist named Daniel Amen who does use brain imaging to help diagnose anxiety, depression, and other mental illnesses. One of his books, Healing Anxiety and Depression, talks in detail about the different types (most people think anxiety is one disease, but there are many different variants), and how different medications and natural supplements can help. He does focus more on Western medication (which I have a strong disinclination for), but does spend some time focusing on natural supplements, which I have found very helpful.
Just thought you'd want to know.