Hi Ember.beanie,
Appointments cancelled at the last moment are always frustrating, especially DWP assessments and you have psyched yourself up! I feel your angst.
I can only suggest you try and enjoy the day, and not to worry too much today. Save the worrying until nearer next time.
Just hang on in there!
LL26
Nothing on this board constitutes legal advice - always consult a professional about specific problems