Some quick basics,,,,

Start taking a good vitamin B complex (B vitamins help rebuild the mylean sheath around the nerves). also a good multi vitamin with high doses of Selenium

Get rid of all aspartame, MSG, caffeine and as much sugar as possible..they all contribute to the frequency and severity of attacks...

Common sense,,eat healthy avoid processed foods and drink lots of water..

Get lots of sleep,, your body heals itself when you sleep

Avoid stress (stop laughing!!) as much as you can,,, you will learn what your specific stressers are and how to deal with them,, but that will take some time..

Get rid of all products that say tooth whitening,,they over sensitize the nerves and increase the amount of pain and the frequency of attacks...if you are concerned about white teeth,,,use peroxide and baking soda a few times a week,, works fine

Also if you smoke now's a good time to quit,,smoking and TN do not go well,,if you can't consider switching to the electronic cigarettes,,, it's a good compromise,,they are what I use,

The one that no one every listens to,,,,learn to meditate,,get a cheap cd on relaxation and breathing and even if all you do is learn to breath through the pain when you have an attack or not tense up during an attack,,,either way it helps..
If you are religious/spiritual adding another meditation along with the relaxation one is a good thing. I don't do both every day but some days I do and for ME it does help a great deal...

And I know that you are in the Uk and the health care system is different but if the pain becomes really unbearable before you get back in to see your doctor,,you can try getting the gel from your dentist,, they have a stronger one that they use to numb your gums before the do an injection ,,,,sometimes they will sell you a jar or give you some to see if it helps....

If that doesn't work maybe your doctor can prescribe some 4% oral Lidocaine,,you put it on a cotton ball and put it on your gums and it can numb things up pretty well for a few hours,, enough to eat at least!!!

If the pain is not oral then the only other suggestion I have is to see if your MD will prescribe the blister pack of Prednisone that you take over like 5 or 7 days and the first day you take a bunch and then over the time it goes doen to the last day being one pill.....that's the only thing I have ever found that consistently worked to cut my pain when I needed it too (my daughter's wedding,,things like that) strong steroids,,,,Toradol (again you can only take for a few days) stuff like that

So maybe someone else will have some advise for you that might help more,,,I hope I've given you a place to start....feel free to private message me if you want or come back and let us know how things are going for you Beth