"Waiting time 3hours plus!"

I see my Endocrinologist every 4- 6 weeks as mu case is quite complex. Upon seeing the Endocrinologist an appointment is booked with them for next time. When I arrive however even though I have an appointment I am told to I have to wait to see whoever is available. I am kept waiting for 3 hours after my appointment time! The nurse and the receptionist have little or no communication and the nurse never seems to know when a patient has arrived. I am a teacher and cannot afford to take so much time off. I book in at a particular time so that I can return back to work after lunch. I am consistently having to call work and they are then left with no one to cover my class. It is riddiculous and has happened at almost every appointment!