Thanks everyone for your feedback, I already feel so much less anxious, just talking with people who know what we are going through

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Grinity- thanks, we are still looking for the best fit for a therapist, hopefully soon
master of none- thanks, the last FBA we had simply said he had a need for control, not what was fueling the need
DeeDee- The only reason they grade skipped him was with his IQ he was so bored and the boredom made the behavior much, much worse. I do think he needed the time in 1st and 2nd to work on his emotional development and social skills, but he simply refused to participate in either the 1st or 2nd grade curriculum and just acted out. The move to third was to get him to engage with the academics at all.
I am currently trying to decide if a low dose anxiety med might be the answer. My pediatrician is reluctant to go there yet, but i have a meeting with his therapist in a few days. I believe a lot of his behavior is generated by anxiety and I need to be more aggressive about getting him more help.
I have emailed Cathy Grayson and she is going to send me a workbook that goes with her book so help implement some of those strategies. Ironically I just started working through the wrightslaw book you spoke of (i put it down to read this

I have seen improvements at home, now just need to figure out what do with school. Thanks for all your support, will keep everyone posted.