Did you remove your son from school in the end? just asking as your description in the previous thread about leaving him with his head in his hands and the devastation school was causing him impacting on his out of school hours reiminded me of my DD when se started reception at a supposedy ok school.
It turned out she was being hit, kicked, punched, scratched, wet on, generally bullied (at 4) by others. We removed her after the teachers solution was to sit her with the bully so they would make friends.
She is now 9 and is still traumatised by it. I will never forgive myself for putting my baby in that situation, and I will never forgive the school for ruining my baby.