Hi @kgrainger, I moved your question about spinal fluid testing negative to this existing discussion where you can connect with other members living with MS.
- Multiple Sclerosis (MS) - please introduce yourself: https://connect.mayoclinic.org/discussion/multiple-sclerosis-ms-please-introduce-yourself/

I also found this information that might be helpful for you.
"MS can be present even with a normal MRI and spinal fluid test although it's uncommon to have a completely normal MRI. Sometimes the MRI of the brain may be normal, but the MRI of the spinal cord may be abnormal and consistent with MS, so this also needs to be considered." Read more in Symptoms & Complications of MS Diagnosis Using MRI Test: https://www.everydayhealth.com/specialists/neurology/complications-of-ms-diagnosis/

What are your next steps?