Another book you might look for is "Who You Were Meant to Be: A Guide to Finding or Recovering Your Life's Purpose." By Lindsay C. Gibson (IIRC). It's not about finding a diagnosis, but about sorting out what you want to do with your life, as opposed to what you might be trying to do because someone else thinks it is a good idea and you feel like you need to buy into their advice. A lot of times if you really aren't getting anywhere it is because you aren't working on what you really want to do. This book shows you how to find out what you really want to do, and how you really can and why you should do it, and how to overcome all the obstacles that have been holding you back. It was life-changing for me, as it allowed me to give myself permission to work towards what I wanted and needed to do.