2tigermom,

Welcome.
Was your testing held against the Revised McDonald Criteria? If your brain MRI had small
dots, the doctor should have been able to tell you if they were lesions and if they were of the type/size for MS. Lesions
on the spine quite often affect gait as you have shared. If your doctor based your diagnosis upon the MRI and LP, I would seek another opinion. There is no specific test for MS. Before beginning Tecfidera, were you screened and are you being monitored?
Stress can cause symptoms to reassert and present. This recurring symptoms could be caused by your spinal lesions. I would encourage you to track your symptoms and see if there is not a commonality for the presentation. It might require 2-3 or more recurring symptom presentations before you find a commonality, and then you may not. Some trigger events can remain elusive or may be from multiple variables.
Stretch, remain well hydrated, and maintain low impact exercise. These can help, BUT there is no guarantee your legs will get relief. You might need to patiently wait for things to settle. It is not easy. Walking that becomes painful is the result of crossing a red line. You need to find a point of moderation. This might require some experimentation as well as looking or listening for other things which might forewarn of your physical limit. For me, going over my red line means my recovery will take longer.
You might respond to pool therapy (not a warm pool). This would allow low impact exercise while keeping your core temperature down. You might have a heat trigger. I have had a worsening heat trigger since 2002. A rise in your core temperature can cause neurotransmitters to stop transmitting, misfire, or slow down. These effects of the heat tend to worsen as the disease progresses. Not all MSers have heat issues. I did ok with heat from 1977 - 2002 before an overall worsening of my MS.
There is a shock following the diagnosis. The grieving process can take time. For me, I learned to redefine "normal" for me and revisit that definition as needed. It becomes a benchmark against which I can judge how my day is. The one thing I can tell you is that your "normal" will very unlikely ever be obtained. Leaving your old normal behind and redefining what is now normal can help you get through the shock and grief.
The good news is that MS is chronic. The bad news is that it is chronic.
As a teacher, an easy accommodation can be made in the classroom to allow you to remain off your feet. When my MS worsened, I did part-time in my power chair. I did reach a point wherein it became more than part-time. But not having to expend energy in my legs, I had energy to get through the day as I was home schooling my sons. I also have a service dog. When my legs lack the energy, my service dog makes a world of difference in pulling me forward. Your school employer might need to make some accommodations, but many are inexpensive and many have grants available.
If you have MS and want to continue in your career, you need to make proactive moves to help yourself. If you have to push yourself through the day, your career will be cut short, I fear. There are so many adaptive equipment products that can help you and they are empowering.
Do not stop moving or stretching, but use moderation. You might need to prioritize things in your life. When I was home in my power chair, I learned that I could do many things with the chair while resting my legs for other activities.
If you need to vent, rant, rave, ask, or share, please know that you are among friends and you are not alone!!

again, Welcome!