I know as a student with a disability, the school's disability office acts as a liaison for any issues going on with the students registered with their office, not just for me but for the professors too about me. I would contact them. I know if there is a specific difficult issue with a professor I am to talk to the director, as they have advised, and confidentiality goes both ways. As this is an issue with accommodating the student and behavioral, this too would warrant bringing to their attention. Something may be going on with the student that they would more be in a position to help. You never know the reasons behind someone's behavior and having taught myself, the disruption and concern are too significant to ignore. I too would talk to the department head as well to make sure he/she is aware, for any additional protocols, support, and recommendations.

It isn't easy to sort through an issue like this as teaching can be difficult enough. Sending wishes for a swift resolution, much patience, and well wishes.