I am so so very sorry to hear this.
It sounds like your great mom intuition might have helped in saving him. I'm glad he was able to get treatment early on.
You just keep doing what your doing and I know he and your other two children will be ok.
My families thoughts are with you.
Please let us know when you have time on how they are doing.
Also please if you need anything don't hesitate to email or call. Even if just to vent.
Sincerely
Rusty