If you had a bad relationship with someone or yourself, then you should check out this book.
If you read books to feel better and motivated, then every other book will disappoint you. No book can stop you from overthinking but many good books will give you a path to understand the reality of this life and how to deal with that reality. Pyramid Mind is one such book. The book will make you aware of your feelings and also help you to address them, to face them instead of running away from such comfortable feelings.