((((((Kathy))))))
He gonna be in pain until he gets totally detoxed and accepts how he has been living his life......his screaming and crying is pretty normal. Try to bite the bullet and just pray for him and trust God.
It would probably be a good idea for you to get to some naranon or alanon meetings and they will help you to understand what your family is going thru. Keep posting here too cause there are a lot of parents here with children who are addicts and alcoholics....(((((((BIG HUG)))))))) and oh... welcome to sober recovery~!~~~