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.
Usually when proprioceptive dysfunction is explained the symptoms described are those of proprioceptive undersensitivity: bashing into things, crashing,
Since I was a toddler, I've struggled with sensory overwhelm. Namely, my mum tells me I refused to wear shoes at around 1,2 and 3 because I didn't like
MY 3 yr old son will put balls in his shirt and play. As soon as he realizes I am watching him he runs and hides. He is VERY persistent about me leaving