we are going down the same road as you bloss, i have been reading a book called martian in the playground which has lots of quotes from adults with as about their school days, it has really helped me tune into the way ds is thinking. it has also made me realise a lot of the things i thought were just quirky are actually part of AS and i have been able to write these down for the lea as evidence to hopefully get a statement.
i go through what he will be doing that day and have bought him a watch which he takes to school to help him keep track of time.
i have also altered my language lots as i now realise he wasnt just being awkward a lot of the time, he is taking what i say literally so has problems if you dont state what you want him to do explicitly (i cant ask him if he would like to do something when i actually mean do it because he often just says no).
exercise is supposed to help, so if you can take her for a run in the morning that may help.
it is also important they have somewhere quiet to go whenever they need to as they can get frustrated when overstimulated. he has been given a chair in the corner of his classroom so he can get away from other kids, this hs been a bit hit and miss as he doesnt always realise in time that he is about to flip
dont use negative reinforcement, if ds feels he has failed even slightly he will give up completely
have you rung the national autistic society? they can send you out a pack of info on AS in kids which looks quite useful (i havent got round to reading that yet)
most of that is really obvious but thought i would post incase any of it helps