Hello. My mother is 76 years old and has diabetes. She has not been feeling well for the last month or so. She has had a severe migraine for almost 3 weeks in addition to an unexplained sudden rash. She has seen multiple doctors who put her on various medications for both the rash and headache. The rash has subsided for the most part, but the headache continues. Over the last few months, her head also shakes. Any idea what might be causing this?