In the majority of cases an individual with mental health conditions remains in charge of themselves. For example, most people checked into a hospital are there so voluntarily. However, there are cases that arise when it is deemed that someone is of danger to themselves or others. This is when the voluntary status may be (usually temporarily) taken away while they receive suitable treatment. Now, there is still a recourse of action for these persons to grieve such decisions and take measures to have them reversed. Some countries, areas, etc even have court at the hospital where a lawyer (usually assigned) makes argument for the patient's rights as an individual to be restored to them. I want to stress this as you seem concerned that your own rights are tenuous perhaps.