Thanks, that other thread is quite helpful, I hadn't seen it! My appointment is on tuesday as well, so hopefully we should both be ok.
I was sort of hoping that I might get some advice from them as well as being able to talk, but by the sounds of it I won't, it will just be talking. Oh well...that may help anyway, I feel like I have a lot of stuff bottled up inside that is confusing me, and it might feel clearer when I have talked about it anyway. I can't really talk to my parents about anything - they both have depression and it won't help them, and I havn't got any close friends I can talk to, so I hope that even if they can't give me advice, I may feel better after just talking to someone!