in reply to @desidawn I totally understand, and I just picked up a great book on this topic, because I have anxiety and tend to "overthink" everything.

"The book is Calm Your Thoughts: Stop Overthinking, Stop Overstressing, and Start Living Again" by Nick Trenton.

It is a short read, 141 pages, and is VERY good and well written. I got my ecopy on Amazon and the reviews of this book were what convinced me to purchase the book. It is outstanding, non judgmental, and it also explains what happens to our brains when we are anxious. The author explains scientific approaches to completely change the way you think and control your thoughts. The author is a psychologist, and I believe he does know what he is talking about, as he too suffered from anxiety for most of his life, and he wrote this book in an effort to share his story to help others like us. I feel better already, just having read only a few chapters. Just being reminded that our ancestors used their "anxiety" as a means of survival was actually quite comforting to me. I hope you are able to find this book. Apparently it is part of a series, as there are other books he has written that accompany this one.