Reddit mentions of The Highly Sensitive Child: Helping Our Children Thrive When the World Overwhelms Them

Definitely give OT a go, has worked wonders for us in a short time. There a few things that work regardless of diagnosis - eg: weighted blankets, compression vests, fidget toys, gym balls. You’ll get a lot of benefit and insights from conversations with them also. Good luck!!

Edit to add: get this book also The Highly Sensitive Child great insights into understanding and managing sensitivities like you’ve described. Of course post here - very familiar what you are describing!