My 78 year old mother keeps having episodes of blacking out. She has diabetes, but we checked her blood sugar and it was 228. This has been going on for some time now. She had a nuclear stress test, EKG,EEG, and an appointment with a ear, nose, and throat Doctor. All these tests produced no answers. When she has an episode it lasts off and on for a few minutes ar sometimes an hour or more. She grabs the right side of her head and groans in pain then goes out over and over. Any thoughts?