Hi Belle, glad to hear your son held himself together.
Sorry to hear about the teacher placement (especially her apparent negative attitude about his sensitivity!).
I agree the teacher can make a HUGE difference, although we've not had much say so far with our ds9.
He had two 'so-so' teachers in 1st and 2nd, and his attitude about school really reflected this.
Ds' 3rd grade teacher was just like you hope for - easy going, understanding, someone willing to think out of the box to help and out of the box thinker!! She was a dream come true. We had forms to fill out this year for teacher 'requests' which are not for specific teachers, but to talk about your child's learning style, etc., for better placement.
Basically I put: someone like his current teacher would be fantastic. For a while I worried/wondered if she was 'too easy' on him, but now I realize she was gently motivating, kind and downright inspiring at times.
I do hope you are able to resolve this for your son and find that gem of a teacher.
Keeping my fingers crossed for both these guys for the coming year!!