Side effects of the Willbarger brushing Protocol

I'm an OT in the public school and started the Brushing Protocol with a student with Autism. After a week he appeared to develop a stomach virus so we stopped the brushing for a week and the when he was better we resumed the brushing. Since then he appears to crave depressurization into his chin to the point of bitting his teacher and other children. My question is have you ever heard of this Brushing Protocol increasing the need for pressure? And how do we stop this need for deep pressure