In the Young Adult section, I have several pages on particular problems that teens might suffer, that are relevant to my YA novels. Here are the resources mentioned on those pages, collected in one place.
Coping with an alcoholic parent (article)
Alateen is for young people who have family or friends with drinking problems.
http://www.mentalhealthamerica.net/co-dependency — this site also has a questionnaire to help you identify signs of co-dependency
https://www.allaboutcounseling.com/codependency.htm — this site also has some personal accounts of co-dependency
Teen depression - A guide for parents & teachers
CopeCareDeal - a mental health site for teens