I have a child like this. If you research intensities in gifted children, you should find some things that describe your child to a T. Also look up overexcitabilities. My child is 9 and still is this way. Though she's managed to handle them better, they still exist. It's just part of who she is and how her brain is wired smile. She gets freaked out by things that wouldn't bother most kids and then she worries about the "what if". We do a lot of talking and figure out what seems rational and it seems to help a lot. I think a child that is intense doesn't grow out of it, but rather learns to cope with it.