My neuro insists on sending me to lab with a tesla 3 MRI machine-much more sensitive. Did your mris include contrast?
I was told time & again that even tho I had lesions they weren't in the "right place" for MS. After my legs locked the neuro changed his mind. He thought a spinal lesion was a disc herniation.
I finally went to a neuro who specializes in MS-spinal lesion is in fact a true lesion....& even tho the brain lesions are in mainly atypical areas it's still MS in his opinion. I've since cooperated and have grown new lesions in the "right" places

Keep your symptom journal up to date-it's your way of validating what's going on. Try to be patient-it took most of us some time to get diagnosed. And if you can make sure you're seeing an MS neuro.