Oligoclonal bands in your CSF, but absent in blood, are what the neurologist is looking for from an LP.
About 80 - 95% of people with MS test positive for O bands in their CSF.
So it seems likely that if your symptoms have continued / you’ve had relapses since you were first diagnosed with CIS (I checked back at what you’d posted before!) then your diagnosis might be altered to MS the next time you see your neurologist.
Not that you can rely on what I say (or anyone else, neurologists are a law unto themselves). I’d just expect it. As I’m sure you do, given the history you’ve had.
I do hope your next appointment is soon. And that then you can be prescribed a decent DMD.