I agree with capp and nightbird. Imo i would take your son to the ER.
you also can always call 911 for help too
FIrst he would be admited because of the withdrawal..
imo I would think he was in ICU for trying to harm himself its on record.
My sister and Dad both were put in the hospital" involuntarily committed."
My son at one point in his life was under age, When he had issues I could have taken him too.
and had him done involuntarily....like my Dad and sister

best wishes to you and your son. I hope he gets the help he needs