G.D.
Sounds like a night terror. My daughter has them occasionally. Was he responding to you at all? When it is a night terror they go into an amnesia like state and are just inconsolable. As a mother it is heartbreaking, but they say it does no damage to them at all. They usually last between 10 and 20 minutes and once they are over the child is back to normal as if nothing had happened, because apparently they do not remember them happening.