Suggest Remedy For Painful Headaches

My mother is 78 years old and have been suffering with painful headaches for at least two years. She has been to see her primary doctor on several occasions, Unfornately, we do not know whay she is having these severe headaches. It seems that the headaches are more consistant. Last month I took my mother to get an MRI, she had a panic attack and refuse to get into the machine . I am aware that the MRI was a start to see if anything else is going on with her. The MRI Test isn't a factor for my mother, because she is afraid of the machine. I do not know what else to do. Do you have any suggestions?