Ive just gotten over the flu, sore/swollen throat etc. I ended up going to my GP as nothing eased it at all, who put me on anti biotics which cleared it up in no time. So you could either do that, or he also told me you can take Panadeine which has codeine in it and i found really helped with the pain in my throat as the plain paracetamol did nothing.

Hope youre feeling better soon.