What to do now?

I am a single white tenured male who is being bullied in a primarily all female department. I am a full professor, have a new book coming out next week, however have been called in my dean's office along with another female colleague of 3 years (I have been here 15 years) and had my course schedule changed to work primarily with freshmen... an insult in many cases. Today we did course evaluations and a student came to me and told me that both my dean and the other colleague had pulled them aside a told him to be certain about his narrative answers on the evaluations. He came to me with a "heads up" and told me he did not know what was going on, but I needed to look over my shoulder because he felt someone was out to get me. This guy is 40 years old and former military. So what do I do now?

Signed,
Confused and Angry