do read this if you yourself are feeling suicidal, or just to equip yourself with knowledge in case you need to help a loved one ...
http://www.scientificamerican.com/blog/post.cfm?id=being-suicidal-what-it-feels-like-t-2010-10-20
http://www.scientificamerican.com/blog/post.cfm?id=being-suicidal-what-it-feels-like-t-2010-10-20