"Incredibly rude and inflexible receptionist"

Although online it says the out of hours service is open until 7pm, when I arrived at 6 30pm I was told I wasn't able to be seen as the last appointment was 6 30pm and it was already booked by someone else. This was a change from the last time I used the service so I went back and asked if they do any walk in appointments any more for future reference. The receptionist was rude and acted like this was the way it had always been. I explained the last time I used the service it was different so I just wanted to know before I make another journey there in the future. I was told to call 111 which I did. As I was in the car park for ages on the phone and waiting for a call back, I saw the receptionist leaving at 6 45pm and the doctor leaving at 6.50pm. The clinic is supposed to close at 7pm. I now can't get an appointment anywhere 1.5hrs closer to home so I can't be seen until tomorrow. I have a UTI and suspect I am pregnant and I am going to have to wait another up to 24hours to be seen. I have also wasted 1.5hrs driving to and from the out of hours and calling 111. It would be helpful if it said the closing time was 6.45pm and that an appointment is absolutely necessary to avoid people having the same drama that I have today. Had I have known, I would have called 111 before I had left. Also, the receptionist offered no warmth at all or explanation she was rude, blunt and clearly working in a role she doesn't particularly enjoy.