I have no idea how awful and helpless this must all feel....
welcome. I hope you can find some support and strength here, as well as perhaps some ideas and understanding toward getting your son some help.
Sounds like he's yet to reach the point he WANTS help, which will be a big barrier.
But in the meantime, get yourselves help and support. This is a good place, but also look into Alanon or other such groups in your area for some direct support and community.
Perhaps the hospital has access to some on-site family and addiction support resources. Maybe you can get some third-party help. A local AA group may be a source for someone in recovery who could come visit with your son.... it may help.... it's worth a shot.
strength, faith and centeredness to you in this difficult time.