Also, doctors and medical staff are held to quite a bit of legal accountability. A lot of it is signed away by the patient, but there are definite protection against malpractice. In fact, quite a large number of organizations and legal firms exist for the sole purpose of pursuing this. Also, most, if not the vast majority of staff want to help not harm- and would probably go out of their way to help.
Litigation is rarely cheap or expedient, but there are cases where blatant malpractice that is documented can be ratified. It is an option, but contacting the ethics and certification board of said professional in violation would probably have a much quicker and pronounced response.
Keep in mind as well, that doctors are people, alike, and although they are held to high standards, they are still subject to errors and mistakes. And despite checks and balances, mistakes still happen, and I agree should be accounted for- however may not legally be possible due to the nature of the agreement. When caught, medical professionals are fired for misconduct all the time.
If such conflict is problematic with one doctor, then try a new. If this same problem starts to arise, I would personally question whether it is something that I am doing to cause this problem.
Much is the same for counselors and therapist- although much more varied with area and regulations. Most require certificaition and answer to an ethics board as well, so any misconduct should be reported. If a profressional is behaving in inappropriate ways, the patient is not helpless- although it may feel so.
As far as warning about side effects- I'd tend to agree that in general doctors overplay the benefits while underplaying the negative side effects. However, in the age of information that we are in, it doesn't take much time to do a little research and discover information the doctor may have left out. Keep in mind placebo/nocebo are real and measureable, so giving you a drug with the misnomer 'yeah It might fuck ya up but hpefuly it helps' likely isn't going to produce positive expectations, and in fact much of the opposite-potentially lessening the efficacy of the drug before consumption
TLDR: to sum it up, we all know there are lots of problems with health care, specifically mental health, which happens to be a rapididly growind area of science. Many professionals disagree, and getting multiple professional opinions is highly advised. There are lots of organizations to protect misconduct, however, medicine in general carries risks which often requires signing acceptance of risk(i.e. botched surgery, nothing can be done unless evidence of malpractice).
We also have the social thread and vent and rant thread here in TDS, which is probably better suited for this,