I did a quick google search and you're right. I have an upcoming ultrasound of my Thyroid and then a referral to an Endocrinologist. I know that I have some problems, by my blood work, but what I have learned is that most of our doctors and even Specialists fail when it comes to "Functional Medicine." People with strange illnesses usually learn/discover these types of dx's when they find a FM Doctor and most often have to pay out of pocket.
The Pineal Gland releases Melatonin and affects Circadium Rythem (SLEEP!). Most people with Depression have sleep disturbance issues. I know that I do!