I have a dear friend whose son was "asked to leave" several pre-Ks. He is neurologically atypical, but with no specific diagnosis. His dad is a pediatric expert, so the child has had every test known to man. He's just not diagnosable.
Personally, I think he was mostly just HG and bored. The problems continued into elementary, and she finally pulled him out for homeschooling. He certainly has behavior issues, but he did a lot better once he was homeschooled and sufficiently challenged.
He's back in school now--with no acceleration or other attention to his GTness--and the problems are back. Color me surprised... His mom didn't think the return to school would work, but went along with it for some valid reasons. I'll be shocked if they're not back homeschooling next year.
About fearing your child acting out EW:
Actually, I was kind of relieved that my son acted out when he was having school fit issues. As hard as that was to deal with, I greatly preferred that to the thought that he might just be silently dying inside... YMMV...
