By Mikey Smith Teachers called for mandatory suicide prevention training for school staff as increasing numbers say they’re turning to pills and alcohol to cope with work pressure. Research by the NASUWT found four in five teachers had experienced more work-related stress in the last year, as the union declared a mental health emergency in Britain’s schools. The union’s annual survey of 11,752 members suggests 86% of teachers believe their job has adversely affected their mental health in the last 12 months. One teacher who responded to the survey said they had “vomited with stress before work…