“Sharp headache and loss of vision?”

In 2016, my mother started to suffer from a strong headache, after several days, her vision started diminishing and she had a foggy vision. She went to an ophthalmologist but he couldn't identify her illness and he told her to go to a neurologist, she did and the same thing happened, after a lot of medical analysis and exams, he couldn't identify the illness. She didn't lose hope. She went to more than 5 neurologists and 2 psychiatrists (because a doctor told her it might a psychological problem). All the treatments didn't give any results, but the headache wasn't consistent anymore and she only suffer from time to time but her vision was always 4/10. A month ago, my mother again started to suffer from a consistent headache and her vision also started to diminish more and more until she became blind in one eye and barely she can see in the other one, after visiting a neurologist that couldn't identify the problem and an ophthalmologist that told her that her left optic nerve is completely damaged and her right eye is 1.5.