"...the Nuro says there is no reason to believe MS is the cause..." (it would have been better if he would have continued with:
"so far, but..." )
Hi Cdimaio,
Some times such testing will not show anything significant; especially at first.
Have you had an MRI? That seems to be the most common 'next step' when symptoms continue and the cause can not be found through other tests.
I would pursue it.
Hope that you get some answers so that perhaps some treatment can be undertaken.
Hang in there. It can be a long and frustrating journey

.
With love, Erika