I've been using Otex - Thanks for the recomendation ksand24 - and it helped a lot, though I'm still not 100%, so I gave up on dealing with doctors for it for now because I had other things going on in my life and didn't have time.
Then last week, to my surprise, I found an appointment card in the post, for an appointment with an ENT nurse at the hospital. I guess the nurse I saw at my GP's surgery did follow up on it when she returned from her holiday.