I too suffer from Trigeminal Neuralgia. I find it flairs up when I am under too much stress. When I am stressed, I clench my teeth while sleeping. This might be the case for you too. My dentist went to a special class in California, USA to study the jaw alignment and claims to be able to adjust the jaw and make the pain go away. It is expensive, so I have not tried the treatment, but he claims success with several of his patients who also have pain. I work on reducing my stress and that seems to help a great deal. Hopefully you can find a solution that works for you. I know how much it hurts and how that 'shock' can make you jump. It is definitely worse than having a broken bone (I had both, so I could compare).