I'm completely numb and emotionless can I ever snap out of it?

My 2 year old son died April 15, 2011 (killed in a car crash). I was just a MESS and depressed and none of my friends understood. Had him as a teenager, still one :/ I was depressed before he was born and while he was one. He was the only thing keeping myself alive. I'm not suicidal, just emotionless and numb. I honestly don't care if I make it through school or not, I could care less about everything. Im spending summer vacation just lying around in my room, listening to depressing music, crying,sleeping until 1 or 3 in the afternoon, staying up until 4 or 5 in the morning, never eating, thinking about my son. My parents try to help, but no one understands. Life is just boring and bland right now. I get sad and depressed at every little thing, and I feel like I'm nothing and no good. I'm never happy. I'll be in college in a couple of years, but I'm not even making an effort to get there. My birthday is this Monday, my son and I had the same birthday. I need help, I have no idea what to do anymore.