((((((((((((((( sw )))))))))))))))))))

Your feelings are valid. I think others have given great advice - keep that appointment, and discuss those feelings with your T.

A friend of mine recently described therapy as a process in which we pull back a curtain, only to find another door to open - there's always more to discover, more depth to our emotions than we may realize. It's T's job to help us figure it out. Give your T a chance to help you walk through that door and see what's on the other side of your anger.