You could have a heavier lesion load than what was seen on the MRI and possible have symptoms throughout your body. The
MRI may be hiding a few things, depending the strength of the
MRI and how thick of slices of the images.
So, you do need to see a neurologist. I would also say that you need to have an MRI of your cervical spine, too. You need a full blood work up. My guess is that your neurologist will find some indicators of a different autoimmune disease.