when the doctor says in scene 3 act 5 " therein the patient/ must minister to himself" what does he mean

Recovery from illness requires a postive attitude on the part of the patient

        or

daily medication by the patient is an aid to sound mental health

       or

he is metaphorically refusing to give macbeth advice as to what to do next

        or

a persons guilty conscience can only be overcome by his or her own action