What Does Tingling Sensation On The Face After An Accident Indicate?

I have a friend who had a car accident about twenty years ago. Her head struck part of the car. Nothing seemed problematic after the accident. But since then she s been having symptoms on the left side of her face and ear. She says she always feels a tingling sensation in that area, and her ear feels hot. Also, her face feels heavy on that side only. Recently her left eyeball seems to be protruding more than the right. MRI and Xray have shown nothing. Ear and eye checkups show nothing is wrong. They have ruled out cancer. Other than this, she is perfectly healthy. She is a beautiful Vietnamese woman, 59 years old. Can you help? No doctor seems to find anything, and she is very uncomfortable daily. Thank you!