As someone who had a doctor tell me I had two brain tumors that needed zero maintenance for the rest of my life, I cannot stress enough the importance of second (and 3rd, 4th) opinions, and finding a doc who cares and speaks your language. Misdiagnosis happen ALL THE TIME. You need a cervical and full spinal MRI, and yes, the dreaded lumbar puncture. Most importantly, you need a doctor who will advocate for you. Try UCSF Neurology. They have an entire MS center- best in the world (literally) and they offer web appointments now. My life changed once I got correctly diagnosed at UCSF. It’s fucking exhausting being pinged around from one doc to the next, but when you finally find the doc who’ll advocate for you and who truly gives a shit, it’s worth the fight. Good luck to you!