What should I do to manage these new mobility issues?

Here is My Question:
I'm a 36 year old female, diagnosed in 2016 with non-progressive relapsing MS; 20+ brain lesions and 4 spinal cord lesions (C2, C6, T3, T4). I'm on Rituximab (1 new brain lesion 2017, everything else great since). 

My legs have been sore for a few weeks so I contacted my neurologist...existing lesions, and I refused medication. My right loosened up but shakes (as usual). For the past two days, my left leg is very heavy-more numb than usual-feels like it's a tree trunk, and I cannot easily go up stairs. Can start with right, but left can't support (pain and weakness). I am sure I am not as severe as others on here, but I don't know what to do when I start to feel like I am losing mobility. What can I do? Do I contact my neurologist? Live with it? Rest? How long should I tolerate it? Meanwhile, do you have any alternative therapies that might be helpful?
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Answer:
It sounds like you have new or worsening weakness and numbness in your left leg affecting your function that has persisted for at least 2 days. You are either experiencing a relapse or a pseudo-relapse. A pseudo-relapse is usually caused by an infection, often a urinary tract infection. 

Either way you should contact your MS specialist for advise. Relapses can and do occur in people on rituximab, even though it’s a very good treatment.

Revere (Rip) Kinkel MD
Professor of Clinical Neurosciences
Director of the Multiple Sclerosis Program
Clinical Neurosciences Director
University of California San Diego