"3rd appointment cancellation in a row"

I had an appointment with my GP who requested bloods to try to ascertain why I was so ill (4 weeks ago). I made the appointment at the desk, on the eve of the appointment, I received a text saying it was cancelled. Made another appointment for a week later. Again the same, on the eve received a text saying it was cancelled, made my third appointment, again received the text saying the appointment was cancelled. I rang reception to ask why the appointment was cancelled 'is the nurse sick or what' was told that it was none of my business and it is cancelled. No empathy or understanding from reception. I am trying to explain to her that it is now the third time this has happened, 4 weeks since the GP requested the bloods. I am getting worse. No response from the receptionist, obviously does not care about the patients, might as well have been talking to a robot. I am still trying to work rather than call in sick, which I tried to explain to her, I have arranged my work schedule 3 times to accommodate the appointment times, again no response. Got offered another appointment a week later during the afternoon, which I cannot attend as I cannot move my work around too much. What is going on with this surgery. Is this where empathy and compassion go to die? I am in urgent need of bloods before I can begin treatment which the GP requested but cannot get an appointment.