Hi Andy, I hear your pain!
I don't suffer from Trigeminal Neuralgia as such, but as some-one with Multiple Sclerosis, I have had it once as a symptom of MS and it was just horrible. With that in mind I can certainly understand some of what you're going though.
I hope the Neurontin is helping your pain especially with the dose increase. I take something similar for nerve pain.... a drug more along the lines of Tegretol, but found it helps my nerve pain more than anything else has done.
You might find the dose increase makes you a bit drowsy at first but try and stick it out if you can, as the benefits are sure to out weigh the side effects.
Do keep in touch. I'm sure others will be interested to se how you're managing.
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