Even if you had some cervical disk disease, it would not cause the sense of smell issues. I have some mild cervical disease at C34 and C45 but this would not cause my periods of facial burning. Sometimes my tongue feels funny too.

It's reassuring to know that the small fiber issues will not result in disability but still it can be painful. It's hard to convince people that something is wrong while you look fine.

Did the neurologists put you through the full MS workup? (LP, MRI brain, evoked potentials, etc)

Thanks