My blog (below) has seven years' worth of comments on harmful therapy.

The writing on the subject --iatrogenesis is slim in ratio to the vast sea of psychotherapy literature, but here is a bit of it:

• The long-lived discussion is "50 Warning Signs of Questionable Therapy and Counseling."
• The Therapy Exploitation Link Line
• "Elephant on the Couch: Side Effects of Psychotherapy"
• "How Therapists Abuse their Clients"
• A Critique of Psychology and Psychotherapy in Social Life
• Surviving Therapist Abuse ? Resources and Support for Healing
• https://www.madinamerica.com/ is more about psychiatry, but covers psychotherapy as well.