Well, doctors do make some mistakes, but cut them some slack you know? Without any doctors, most of us would probably be...well, let's just hope you get the point. One suggestion that you should keep in mind, is to at least get 2nd opinions from other doctors. Some of these people are fresh of Medical School, and they are not exactly the most trustworthy people concerning any serious medical decisions. Maybe the next time you get treated to something new, ask the doctor on the procedures that will be taken during the experiment. Tell them about your medications, and any problems you feel you might have. If you don't trust the doctor, go see a new one.
As for the waiting line, suck it up, we all have to deal with it. Doctors require rest, and if they are an hour late for a simple non-life threatening check-up, then why make a fuss? Sure your time is killed, but I'd rather have a doctor who is fully awake rather than a drowsy one making tons of mistakes.