Yes, hypersensitive and overstimulated is exactly right.

My daughter is three and is a mix of sensory seeker and hypersensitive. She moves constantly (e.g., having her sit still for a meal is a battle), is strong-willed, and has a lot of annoying little habits that involve repetitive motions or sounds that are very grating for someone like me. She doesn't seem to get tired in the traditional sense despite all the activities and hours of outdoor time she has every day. If anything, her version of tired is to be more hyper than usual.

She is bored easily, doesn't like to play by herself, and requires non-stop close supervision (obviously, all toddlers need supervision, I am saying that she needs more than others). She is a smart, funny, and delightful child, but she doesn't take no for an answer, screams and throws tantrums when she doesn't get her way, and wants things done in a very particular way or she'll lose it. I have quite a bit of help to take care of her and she still manages to wear everyone out. I love her, but it's hard when a child is bossy, irritable, angry, and stubborn to this extent. The constant motion and the screams, combined with the anxiety I feel over her frequently careless behavior (again, comparing to other toddlers, not to older children or adults), put me in a state of perpetual tension when around her.