They should be able to advise you on the phone if a nurse will do, there are nurse practitioners at my doctors who can treat all kinds of minor ailments and they should be able to check, given your symptoms if a nurse can help or you should be seeing a doctor.
Our practice has a phone back scheme where a GP or nurse calls you and, if appropriate, they then arrange the right appointment for you, if yours has anything like that?
I have quite a few water infections and try to drink lots of water and cranberry juice to help as well. Due to the high sugar, cranberry juice can be diluted with water too.