Hello, hope your pain has reduced. In case you are still suffering, before causing anything idiopathic, all efforts should be made to rule out other possible explanations ( which was done or no in your case?) there are many mimics of trigeminal neuralgia, which are to be considered in your case considering mri is normal. Detail history with nature of pain and associated symtoms will be needed.
Next Steps
Try to maintain headache dairy
Health Tips
Avoid triggering factors