Sally Saying a prayer for you! I know that weak feeling when trying to maneuver stairs is so scary. I not only get weak legs, but a tad bit of vertigo when I go up or down steep staircases.

One thing I have noticed that affects me ...is temperature changes. If I go from hot to cold or cold to hot... my weakness due to MS becomes more apparent. Since you were going down into your basement there had to be some temperature variance from the main floor. Even a 2 to 3 degree difference bothers me.

I noticed you said you might have a virus.. that will do it too. Even slight fever throws me off.

I've never had issues with the B12 or Vit D. Now if I take a B12 after lunch time, I can't go to sleep before 2am.