I am an epileptic and i take tegretol medication. can this cause severe neck pain and then cause headaches / migraines over the left eye and front part of head?

Neck pain,headache: I don't believe that these are side effects of tegretol. These symptoms are characteristic of occipital nerve neuralgia or impingement of the occipital nerve at the base of the neck vertebra by a disc or spur. Your neurologist can evaluate you and order any appropriate tests such as a neck spinal xray or MRI in order to pinpoint the cause of your headache and neck discomfort and treat it.