A close friend of mine committed suicide on his high school graduation night 3 years ago. He had attempted several times before, but his family and most people who knew him considered it a phase and 'he'll get over it'. When he finally succeeded, it was due to 72 benadryl and a vinegar chaser. I wish that I could have done more, but I couldn't. I feel your pain, and I am deeply sorry for your loss. I am sure there are many unanswered questions (I still have them, 3 years later) that you will never find the answers to. This is the kinda thing that never leaves you. If you want to talk to someone or even just want to vent, feel free to PM me. Be strong and know that we are all thinking about you!
No one deserves to die so young....