My husband went through this with his parents. Before they finally divorced when he was 17, they had him to see counselors because of his acting out. One psychologist even diagnosed him as paranoid schizophrenic (my husband was SOOO mad at his parents that he would deliberately act crazy to manipulate teachers and counselors).
Most counselors are pretty savvy and realize that a person doesn't develop in a vaccuum, and their environment plays a large role, but they can't know what you don't tell them. Even if you're bipolar (heck, it sounds like your dad may be also), medicine isn't going to solve your problems with all of the family stress going on. Your parents' ablility to maintain a squeaky clean image for others has made you the scapegoat to distract ousiders (and even themselves) from everything else wrong in the family.
This is why the court ordered counselor is probably your absolute best chance at getting help. You need someone to confide in, and you need to let the counselor see the whole picture of your life. The counselor may be able to persuade the courts that you need to live in a different environment. Whether you're bipolar or not, really isn't the most important issue you're dealing with right now. Even if your depression is situationally based, some antidepressant medications could be of benefit, but you'd want to talk to a psychiatrist about that, not a family doctor. For example, neither my husband nor I are clinically depressed, but I have fibromyalgia, and am taking amitryptiline to reduce pain and help me get a restful sleep (fibromyalgia often involves disruptive sleep and other sleep disorders). My husband takes Cymbalta for nerve and degenerative joint pain.
I do wish you the best, and really encourage you to find a psychiatrist and counselor you trust. It is so true that your environment may be creating your problems, but if you don't address them, the problems are going to get worse and be harder to get rid of, even after you move out of that house.

and I've calmed down considerably in the process by knowing I've found my niche and I'm not alone.
