Hi kataraa, most of my research as well as my Neurologist say thy way we are diagnosed is our symptoms we share with drs. The MRI is important to rule out Tumor, Cysts, etc
How many patients with TN has your doctor treated? What tests have they done? An MRI or MRA specifically for Trigeminal Neuralgia protocol? Has any medication stopped the pain or lessened the pain? If an anti-seizure drug lessened the pain but something like Motrin did not, it may be TN. If you do not have confidence in your current Doctor you have every right to seek out a second opinion. But try to find someone with lots of experience with facial pain. Good luck, let us know what you find out