What parent is thinking clearly when their child is sick or injured. Healthcare workers dread interacting with a difficult parent who who doesn't understand what is going on and who is so emotionally distraught that they are hindering the care their child desperately needs.
In these cases its best to take out your frustrations on you patient advocate so the doctors and nurses can do their job. If they are not providing the necessary care your advocate can address it without emotion.
Anyone who has taken their child to the ER knows it is almost impossible to be attentive to your child's needs and communicate effectively with healthcare providers.