Laura, I have TN that hits both sides.

"bilateral" TN is not the usual manner, but it does occur.

Trigeminal neuralgia (TN) occurred in 35 patients (1.9%) from a large multiple sclerosis (MS) clinic population (N = 1,882). TN began on average 11.8 years after the first MS symptom but in five patients was the first symptom of MS, preceding the next MS symptom by 1 to 11 years. The onset of MS was later in the patients who had TN, and bilateral TN occurred more frequently than expected (in 14% of TN patients).

http://www.medscape.com/viewarticle/431442

Seven consecutive patients with multiple sclerosis and trigeminal neuralgia were investigated with MRI to determine the occurrence of a lesion which would account for the patients' pain. Two patients had bilateral symptoms.

http://jnnp.bmj.com/cgi/content/abstract/59/3/253