Psychological interventions - Australia Assignments

Do mental health difficulties following a stressful life event always indicate a diagnosis of PTSD?
Do psychological interventions lead to physiological, neurological, and/or biological changes?
Can complementary and integrative health (CIH) intervention(s) be used to improve mental health (or a specific disorder)?
Why do some people go on to develop a substance use disorder while others do not?
Are psychedelics effective treatments for people with mental health difficulties?
Should we be taking a disorder-specific or transdiagnostic approach to mental health?