Talk to Neuro Physician on Headache

My mother has been suffering from headache since two years. She feels twice in week which lasts for 3 days. It starts from morning and complete headache,and gets severe in last 2 days,In last day she feels one sided headache then ends.. No medicine or any pain killer works once she gets pain. It is complete headache. No problem in sleep, sometime vomiting occurs. It sometime occurs due to noise as well. We have get done CT scan of brain, as well. Dr. Prescribed medicine for 1 month, After taking medicine 1 month, it was OK, but as she left taking medicine, the same problem started again... Please help @Dr.s what's problem? Is it stomach problem or Neuro we are very worried about it.. plz