What Causes Swollen Optic Nerve And Headache?

For the past year and half I ve had headaches, whooshing sounds in both ears, temporary blindness in when eye after bending over, quick moments of spinning/dizziness, and nausea. Went to eye dr and optic nerves were swollen. Neurologist has ordered MRI mrv, and blood work all were normal. A lumbar puncture was done and pressure was on low range of normal,12. So this rules out tumor, psuedotumor, autoimmune diseases, infections and blockage. Neuro is about to pass me back to optholmolgist cause she says their isn t anything wrong neurologically. I feel like she is wrong. There is something going on just not sure what is causing all this. Any ideas?