sweetie, he obviously CAN live without your son, because when he's high he isn't really there! Sorry, but I'm a recovering crack addict and when we addicts are high, we are emotionally unavailable to anyone.
As far as if he dies, do you get rid of the drugs/parephenalia? That's tampering with evidence. And yes, you will be charged for endangerment of a child because your child is allowed to be around someone who is using drugs. My friend just did a year in prison for this.
I'm sorry to be harsh, and I'm even more sorry you are going through this. But if you read some of the other posts around here, you'll see that a lot of people here are going through the same thing, and you are not alone.
Hugs and prayers!
Amy