All in your head? How does he know, has he tested your head to determine this? This is the type of medical help I cannot believe.
Can I honestly recommend you fire this doctor, and see another.
Also, have you had a 5 panely thyroid test? And a resulting ultrasound to make sure you don't have thyroid disease? If anxiety, shortness of breath, mood swings, depression, etc., are on your symptoms list.