Against Medical Advice: One Family's Struggle with an Agonizing Medical Mystery Book

This is James Patterson's first foray into non-fiction, slapping his name on Hal Friedman's true story about his son. Right on the cover it says "One family's struggle with an agonizing medical mystery" so imagine my surprise when I figured out what he had on the first page of the preface to the book and my diagnosis was confirmed on the very next page. I guess the mystery is supposed to be why nothing was able to help this patient with OCD and Tourette's for 13 years. Instead, I found several other mysteries. For example, why would the author think telling the story from his son's point of view would be "more powerful" than telling his own story? Personally I found it distracting because he kept inserting comments about Mom & Dad's feelings and parental compliments which were likely his own POV, and there were many stories about things his parents didn't know happened yet we knew Dad was telling the story. If all this first hand information was given to the author, why not share writing credit or just let his son tell his own story? Why is the book less than 270 pages but it has 73 chapters, a preface, a foreword and an epilogue (the latter two were the author's own voice)? Why is the story not told completely linear so the reader can get a proper sense of the escalation of frustration etc. I felt I was wandering aimlessly through vignettes of someone's life, and it didn't quite tell the story I thought I was getting. Obviously this was a terribly long and painful journey, so I was quite frustrated that it was written so oddly that it didn't have the impact I feel the author wanted it to have.