A good post. I love health and fitness issues.
Those four questions are ones I generally know the answer to before I even ask the doctor (I try and do my research beforehand).
I can be a pain in the butt for a doctor, who I thankfully (God willing) don't see very often, but, I look at it this way, "who is going to look after your health better than you"? So I ask questions, get clarification, challenge him where need be.
The doctor sees me 15-20 min., I live in my body everyday, I've got no way around it. Thus, try your best to take care of yourself, a doctor alone cannot do it for you. It's why I believe in prevention rather than medicine after the problem has taken shape.
Now, obviously some diseases are out of our control. Its a sad reality of life. However, we have to all be our best doctors. It's a major problem in the West, in particular in Canada, to just believe a doctor can cure everything and we have no responsibility.
Doctors aren't Gods. Ask questions, get answers. Demand proper treatment.