Whether you're dealing with an emotional bully (see previous post about adult bullies) or other difficult situation, one of the first steps is to comfort yourself and manage your emotions.
The part of the brain that is responsible for decision-making and planning cannot function as well when you are filled with emotion. Acting on emotions without the thoughtfulness of the logical part of the brain usually means trouble.
Even when you're in the right about a situation, if you act impulsively and emotionally it's unlikely others will listen. They'll tell you to calm down and don't get so upset. This situation happens frequently for the emotionally sensitive and they soon believe no one listens to them. They also may find themselves reacting first and regretting later.