I need some advice to not do anything stupid?

me and my friend have known each other since birth. we always kicked it everyday and hung out and we got real close like family. fast forward to September 17th, 2010, i get a phone call 5am from my other good friend and they let me know my homie got shot 3 times in the head and died. i was in shock. well since then my life just going down, my main thing to live for right now is revenge but im not sure i can even stay alive that long cuz i got suicidal thoughts. i dropped out of school, started drinking a lot, cutting myself, getting into some drugs, but im gettin tired of all that and dont know what to do. cuz i dont feel like living at all anymore cuz he was my brother it aint gonna be the same. ive shut myself from people to and now i just want to go die and see my homie cuz i miss him so much. i just dont kno what to do....