"No appointments available"

Absolute nightmare to book an appointment. Cannot get it booked over the phone as "there is no more appointments available for a day". Today I went to book an appointment in-person, I got to the medical practice before opening time, I was the third person in the queue just to be told that there is no appointment available for the whole day! Unless my health issue was not important enough as it was the first question asked... No appointments to book in advance either. Very disappointed, stressed and concerned as my health condition might worsen