I'm so sorry to hear of your loss. Here's a site for parents who have lost a child to an overdose but I imagine they would love mutual help from/to you (or e-mail the people running it to ask about your situation and if there's a comparable site?): http://www.healingheart.net/Child_drug_overdose.htm

This looks like a good organization http://www.kara-grief.org/index.html#groups It's in California but maybe e-mail them and they can tell you how to find something similar in your area?

They review a book, Disenfranchised Grief http://www.kara-grief.org/Reviews/Di...ief_Osborn.htm which is about people in your situation. You might look for that?