There should be no reason you should have to get another LP. Your neuro might order an MRI , but I highly doubt he'd see a reason to order another LP. You had one that helped you get your diagnosis of MS it looks like. The neuros don't order them for relapses, just to rule out other things when we're in the process of getting a diagnosis.

Feel better soon. The change in seasons can be hard on most of us it seems.