Can I resume taking amitriptyline the day after taking one 100mg dilantin. I am on lyrica (pregabalin) 600 mg and had been amtrip for a week for trigeminal neuralgi?

See a neurologist. Yes you can, but ... The combination you described is not exactly TN protocol. Get a second opinion, see a neurologist or orofacial pain specialist for evaluation, imaging, and management. Ask about MVD surgery. In my clinical experience, MVD is the preferred treatment for Trigeminal Neuralgia. Take care.