I'm so sorry, the weekends are slow around here, so members aren't here to read your post, I just saw it and want you to know I read it and will be saying a prayer for you and your son and your family.
This is not my area of expertise so I don't have any words of wisdom for you, just another mom with a wounded heart reaching out to you as you go through this terrible moment in your life.
When you go home and he is left in the hospital, make sure you and your husband take good care of yourselves, this is an exhausting and scary experience and you'll need your strength..........find support for yourselves and support each other.
Others will likely be around later or tomorrow. In the meantime, hang in there, take deep breaths. I'm sending you good thoughts and hugs too.