Tell the COBE and School overseer that you would like to speak to them about a very sensitive subject. Privately tell them that you are having anxiety issues and would like to "temporarily" step down from the school. Tell them that you are currently getting treatment for the anxiety, but for now, you need to focus on your mental health and need to be humble about your circumstances and recognize your limitations, but that you are also embarrassed and would appreciate their confidentiality.
That's what I did. They offered sympathy and some "comforting" scriptures and said that I should take all the time I need and let them know when I am ready again.