What Causes Dizziness And Weakness Despite A Normal MRI Report?

my mother is 84, living in another state. She recently suffered a TIA. She has dizziness every day, and is very weak, has gotten progressively worse over the last several years. She has had MRI, no brain tumor. She is scheduled to see an inner ear specialist in August. I just spoke with her on the phone. As I was speaking to her, she said she couldn t see well as her vision had black spaces in it. Do I need to call the paramedics?