My heart is breaking for you. I have a 12-yr-old son and I know I could very well be standing in your shoes one day. I always feel worse for parents of addicts than for anyone else. Parents are supposed to be able to take all the ouchies and nightmares away but we can't fight the devil of addiction. I'm especially saddened for you because your son is just a baby. He's only 15. You, your son, and your family are in my prayers.
Please do things to care for yourself. (((hugs to you)))