Inflammatory breast cancer

I think I have inflammatory breast cancer. It started quite recently and now I'm worried it's spreading. I saw my GP yesterday morning and she referred me to one of the nurses.

I have an appointment on Tuesday afternoon with the nurse.

But today the dimpling has spread on my breast also a red rash and some petechiae just above my breast trailing over my left shoulder. I'm worried that it's IBC and by the time Tuesday comes it will have spread even more. Could anyone suggest what I should do. I did ring the doctors surgery but there was no one to speak to and no appointments left.