Both of my twin girls have tantrumed but it has likely been for different reasons. One was hyper responsive and the other hypo. They are now 8 and doing very well.
OT, listening therapy and recognizing when they were getting out of sync has helped enormously. Also, for one, who is not a big eater, paying attention to her food intake has helped. In our case, some yoga, resistance, a quick jump on the trampoline or a run around the block when I see that they are getting unregulated typically does the trick.
Also - likely not an issue for your son - but one of my daughter's had seriously compromised vision, which led her to be off balance, and have double vision frequently.
While I knew that she had strabismus, I did not get good information from a serious of pediatric ophthalmologists and didn't realize how much her vision was impacting her behavior until we addressed this area.
When I was a young boy, I had a cousin in her teens who always used to hold me on her lap. And somehow there was an unspoken custom between us, that she
I had shared some of the IEP humour from this site on a yahoo group. Another lady then shared this game. He takes the most commonly used phrases in a meeting