PhD student target of crazy department head I got behind in my program because of illness. My university says it's ok for me to have extra time, but the department head of my program doesn't like this because he thinks all students must get a certain time. He wants to cut my funding, which would force me out of the program. He doesn't even care that right now I am doing good work. He just wants me gone. He spreads false rumors about me to other professors. The graduate director does nothing and says it is not his place.

My adviser likes me, but I don't think he is willing to always stand up to the department head. It is late in my program and I can not start over at another university. Thank you for your advice.

Edit: Getting behind was not my fault and my adviser knew of my illness. How can I persuade the department head that he should forget about my illness and let me work now so I can finish?
Have you considered reaching out to your office of the Ombudsman/woman? Often times, they serve as the official/unofficial mediator when it comes to conflicts within an organization.