Although it is not clear what kind of scenario you are looking for and the what the learning objectives are, have you considered using a standardized patient beside the SimMan patient monitor?
You may find a useful scenario by searching ( doing CTRL F "mental health") in: http://www.health.heacademy.ac.uk/rp/publications/projectreports/alinier260109.pdf
Professor of Simulation in Healthcare Education & National Teaching Fellow (2006)
University of Hertfordshire, UK
Programme Manager - Simulation
Sidra Medical and Research Center, Qatar