What areas do you experience the pain?
While an infection
could occur, it would unlikely present with just pain for such a long time without any other symptoms.
Other medications that you could ask your doctor as alternatives include baclofen, phenytoin, oxcarbazepine, or lamotrigine. However, some people with trigeminal neuralgia eventually stop responding to medications, or they experience unpleasant side effects. In those cases, surgery may be an option.