How does the diagnosis process work from here?

I'm M 45 in the UK.

My GP originally sent me for an MRI of my spine because of ongoing back issues; we all assumed it was a trapped nerve or a bulging disc. However, after the consultant radiologist reviewed the scans, I was referred to a Neurologist due to "areas of concern."

At my NHS neurology appointment, the consultant sat me down, went through the MRI, and—BAM!—just like that, told me, "We strongly suspect you have Multiple Sclerosis."

I was in total disbelief. I only went in there for a bad back. When I questioned the scan, he explained that he and other senior specialists had reviewed my MRI, symptoms, and timeline, and they were almost certain. He ordered a brain MRI and a lumbar puncture (LP) immediately. Within a week, both were done. After the brain MRI, he called me to say that, as suspected, there are lesions in my brain as well.

A couple of weeks have passed, and he called again to say the LP results were actually inconclusive. He’s now discussing my case with his colleagues in the NHS Trust (an MDT meeting) and wants me to come in for a review.