@jk Thank you for your response. Not having a diagnosis is one of the hardest parts of a problem, physical or mental, and I'm glad you were proactive in getting help. Sounds like it saved your life. I live in a large urban area with plenty of medical help, although I belong to an HMO, so access to doctors can be limited. They are very good about testing for various things, and while this is good, it is often the end of the conversation if nothing shows up.
Overactive brain is definitely frustrating--I have tried meditation, listening to audible books, and some Yoga before bed. My sister swears by a little warm milk with cinnamon if she gets up in the night. 🙂 Hope you find something that works.