Teaching is one of the toughest jobs to return to with PCS. Schools, especially high schools, are buildings full of over stimulation. You will need to find ways to reduce stimulation.

You might find that some students will react well and others will need to be shown the door. Talk softly in class. Get you classes to respond softly. Maybe relegate the noisy students to the back of the class and let them choose to fail your class. The quieter students who are interested in learning and a decent grade can get you attention.

A No Tolerance No Cell Phones rule would be good. You do not need to be hearing beeping or buzzing or vibrating. Your brain will be distracted by it.