Sorry to hear you are suffering. I had my first chemo on 28th November and am just starting to have a bit of a sore mouth. My district nurse has recomended something called 'nystatin' or 'glandisane' which you can get from your GP I think. I hope you get it sorted.
This is all a really nasty business isn't it? I feel like I'm just sitting her waiting for the next side effect to happen.
Have you joined the December monthly thread? I am finding these very useful and there is lots of support there.