no I did not try to talk to the department head or any one else. my reasons are first, yes I might end up with other supervision but the new supervisor might try to shift my project in certain direction. I am already standing on my own and getting my results. second, in term of looking the future I need to get job may be with some people in the same department. I do not want them to remember that I am the one who has a lot of problem and dumped my sick supervisor. thirld, it is sensitive topic every one will hesitate to involved especially my supervisor is coming to the department. I decided just to keep going.