Mind & Psychology - 68 free documentaries about mental health.
Start with MASS PSYCHOSIS - How an Entire Population Becomes MENTALLY ILL (22 min, After Skool), then Mental health and resilience - the secrets of inner strength (52 min, DW Documentary). All 68 documentaries here are free to watch from their makers' official uploads. To read deeper, the top-rated book on mental health is The Body Keeps the Score by Bessel van der Kolk.