I found it easier to talk to a therapist, who had BC herself by the way... Don't ignore depression that you can't fight by reading books, writting or other attempts.
In Wikipedia this paragraph caught my eye and thought it would be helpful here.
Cancer
PTSD is normally associated with trauma such as violent crimes, rape, and war experience. However, there have been a growing number of reports of PTSD among cancer survivors and their relatives. Most studies deal with survivors of
breast cancer , and cancer in children and their parents, and show prevalence figures of between five and 20%. Characteristic intrusive and avoidance symptoms have been described in cancer patients with traumatic memories of injury, treatment, and death. There is yet disagreement on whether the traumas associated with different stressful events relating to cancer diagnosis and treatment actually qualify as PTSD stressors . Cancer as trauma is multifaceted, includes multiple events that can cause distress, and like combat, is often characterized by extended duration with a potential for recurrence and a varying immediacy of life-threat.