I'm sorry that you are in so much pain but I want to kinda echo what has been said. Coming here and talking at anytime helps everyone. It's a community and the more honest we are the more others people don't feel so alone.
I know about bulima and cutting I have been doing both for a really long time. For the most part they are the "shameful" ways of hating ourselves. For a while you can hide the cutting until it gets out of control and the same way with bulimia - you can hide it for the most part.
But here is the thing, you are not hiding, you are talking and sharing with others. You have made an appt., to see the therapist, and done a lot of other things that are helpful.
You can feel good about your choices the past few days or beat yourself up over not getting to the therapist earlier. I think the first might be the most valuable. I know it might be hard, but why not chose to give yourself some credit.
Thanks for sharing with us and let us know how you are doing and how we can support you.