I missed the first part of what was going on but I'm glad you got him moved. From what I gather from this post that his situation was not good at all.
Anxiety about the move is natural. Anything new in the middle of the year will produce anxiety. He'll adjust quickly with the help of his new teachers.
Have you met his teachers? Do they know the reason for the move? Have they heard that reason from you or from the principal or from the other teachers? I think it's important that they hear it from you.
Let us know how his day goes tomorrow.