Update on my quest for a treatment. I spoke to a lovely pharmacist who really seemed willing to help.
@Pattidevans mentioned pharmacies are now able to prescribe antibiotics and there was a poster saying the same, including UTIs in the list of conditions. Unfortunately she couldn't prescribe them to me because they have to follow protocols and are only able to treat very basic and mild cases. Because of some of my answers to the mandatory questions, she had to refer me back to the GP. She even went with me to the surgery (that's next door) to see if that helped, bless her. The receptionist told me the same as in the morning, they don't have any appointments available today, but they did take a sample and said they are going to test it and call me back if I need antibiotics.
The receptionist said if I still feel I need to speak with a GP I should call first thing in the morning to try and get an appointment. I'm not sure if I should call. They already have the sample so what else is the GP going to do? Would you call?