Is the irritation external only? Or internal, within the vagina? If its external only there is a chance that it could be Lichen Sclerosus. This condition presents in a very similar way to thrush in that it itches and/or burns, it can also cause white patches on the vulval skin and around the anus.
If it is LS it needs treating with a steroid cream so needs diagnosing by a GP, but not many are aware of the condition and it is often undiagnosed. Many women get a better 'service' by making an appointment at a sexual health clinic so it might be worth seeing if there is one near you.
I'd definitely make an appt with the female GP, even if it is several weeks away, you can always cancel if you manage to get seen elsewhere.
It is also possible that's its vaginal atrophy and Gina should help with that. Try it whilst you're waiting for GP appt, it can't do any harm to do so.
Definitely make that appt!
Suzie
(I've just realised that the forum duplicated your post and I replied to the other one, copied my response here so you have them all in one place)