If you have a life-threatening emergency, always call 911 for ambulance transportation to a hospital.
Reach Out 
1-800-448-3000 
http://www.reachout.com
ULifeline
  http://www.ulifeline.org/
 National Suicide Prevention Lifeline
    800.273.TALK
  http://www.suicidepreventionlifeline.org/
The Trevor Project 
     800.4.TREVOR
  http://www.thetrevorproject.org
  National Sexual Assault Hotline
800.656.HOPE
http://online.rainn.org
 National Institute on Alcohol Abuse and Alcoholism 
    http://www.niaaa.nih.gov
 National Institute of Mental Health
    http://www.nimh.nih.gov/
Alcoholics Anonymous
    http://www.aa.org/
Narcotics Anonymous 
    http://www.na.org/