I've written a book detailing my illness which began 25 years ago, until very recently. I have detailed the attitudes of nurses, doctors, surgeons, physios and so on, but not mentioned anyone by name. Little anecdotes about other patients with whom I came in contact appear in the book, also anonymously. I have referred to a particular nurse as "Indian" - not in a racist manner, but simply to record that she couldn't understand a patient defying a Medical Specialist because it couldn't happen in her culture. Can I be sued for defamation?