Thank you JessicaX,
It's weird that you said you didn't answer the "one what would you do question" because all of mine were "what would you do questions". Not one was about me and why I want to be a social worker and past and present experiences. It blew my mind that it turned out like that but I guess every interview is different.
Thanks for the advice. I am a little calmer, but I just can't get past the fact that the interview was so not a reflection of who I am. I think they might be confused with that person and the articulate one that came across in my personal statement.
Good luck with your future social work career!