Hi Momz!
My first episode was optic neuritis. I had all the symptoms you had with it except the pain.
After an LP, evoked potentials, a blood test that checked for 17 diseases, and an MRI, I was diagnosed with MS. It was way too easy!
There are a lot of folks here who have the same test results you have. It may not be showing on the MRI and in some of the tests, and still be doing subclinical damage. Only time will tell.
It sounds like you have been through a very long road here with your health. I hope you find some answers.