I have not had this type of experience but I have had others in which I gave someone power over me and suffered severe mental anguish over it, leading to a nearly successful suicide attempt. After nearly 10 years, most of them spent in therapy, I have the power over my own life. I will not abide this individual to affect me in such a way again.
YOU are in charge of your own happiness. The phrase "you make me mad" or the like is hogwash. Folks cannot do to us what we don't allow them to do. Turn around, uninvolve yourself with these folks and walk the hell away! And you will do this for YOU! YOU are important and I believe you can be strong in this! It won't be easy. Whenever someone wants to talk about "the situation" (and they obviously will because they seem to thrive on it) tell them you don't care to discuss it and change the subject. If they don't want to do so, walk away, leave the place where you are both occupying the same space. Leave that person with her mouth hanging open. Whatever the topic is, it cannot kill you and what doesn't kill you makes you stronger! I know this for a personal fact, dadgummit!