Loubelle, best of luck, be brave.
Maybe recording it secretly (have a dictaphone in your handbag) might give you a feeling of a bit of control and power? I think it would for me, because I know I could let someone else listen to it later, and not have to remember all the crap they are going to come out with.
Anyway whatever you do, I hope its as painless as possible and over quickly.
Hugs to you.