Role of Ultrasound Guide Greater Occipital Nerve Block at Second Cervical Vertebra in Migraine Headache Prophylaxis

* Neurologist screening candidate volunteers for this study, following the inclusion and exclusion criteria * Candidate volunteers attended pain clinic for he protocol detail about this research and informed consent * After signing consent, Volunteers would be stratified randomization into 2 groups between Normal saline and bupivacaine * Volunteers would be done base line headache diary for 1 month before performing the procedure (Week -4 to week0) * At Week 0, Volunteers would be applied local anesthetic cream at skin injection site before done the procedure * According to stratified randomization, Pain interventionist and also volunteers would be blinded to the group * First Unilateral greater occipital nerve block at Cervical spine level 2 (C2) was done under ultrasound guide (Week0) * Telemedicine Follow up at week 2 * Second Unilateral greater occipital nerve block at C2 level was done under ultrasound guide (Week4) * Volunteers would be follow up via telemedicine and done headache diary until 3 months after 1st injection * Volunteers would be follow up according to outcome monitoring protocol in Week 0,4,8,12,24