I'm not familiar with that diagnosis but after googling it, the description matches the behavioral issues of one of my kids. Turns out that a substantial part of that behavior, in our case, was due to long-undiagnosed celiac disease (and associated malnutrition, suspected neuro damage, etc.); we're seeing continuing improvement on a gluten-free diet, and relapses upon inadvertent re-exposure.
Mentioning this because we consulted about a dozen doctors, psychiatrists, OTs, counselors, etc. along the way, and none of them thought to check for this (until, finally, one did - and the blood draw revealed off-the-charts antibody levels) - so make sure to discuss with your ped to confirm that all possible underlying medical causes for irritability, etc. have been considered and affirmatively ruled out.
