Really upset about delays - surely this isn't right

Hi all

I had my breast biopsy results (4cm grade 1 cancer) on 19th and I had my MRI on 1 May and my mammogram on 8th May. I've been told today (because I chased them) that the results are in. Its not been listed for MDT yet and they don't think they can bring forward the appointment from 7th June because there is no clinic space.  I'm distraught!  This seems ridiculous. 

I'm petrified it's spreading in the meantime. They did give mr a prescription for tamoxifen which i am now taking. I'm only 39 and have a 4 and 6 year old. How can they do this? 

Is there anything I can do? 

Many thanks in advance x