The law of similars, by Chris Bohjalian

 

Reading The Law of Similars was like watching a slow-motion train wreck. Leland is a recently-widowed lawyer whose tendency to hypochondria is put into overdrive as he tries to keep himself together as a single father. He gives homeopathic treatments a try and begins to fall for the homeopath who's helping him. As one of her other patients dies after her treatment, Leland's law firm is asked by the patient's wife to represent her, and Leland is forced to face not only his hypochondria, but also ethical dilemmas that have far-reaching repercussions for others. The writing is excellent and the plot pulls you along, even while you're silently screaming "No!" "Stop!" "Don't do that!" to Leland.