I have been getting headaches every day all day for about 6 months now. I had an MRI done and I have a chiari malformation but my neurologists believe it has nothing to do with my headaches because the herniation is only 5 mm. I also have poor balance, I see black spots in one eye, I am very nauseous, I am sensitive to loud noises, and my neck and back hurt a lot. The pain usually starts in the back of the head and radiates to the entire head. What do you think is causing them?