I'm sorry to hear that you are on steroids for the MS right now (must be something going on) and that you are experiencing leg pain.
Steroids will deplete the body of potassium. One symptom of low potassium is muscle cramps. When I am taking steroids, I make sure that I eat LOTS and LOTS of foods high in potassium. Some of my favorites include bananas, orange juice, raisins, spinach, apricots, cantalope. Here is a list of foods high in potassium.
If trying the food route doesn't seem to help, then please call your doctor. You may be experiencing spasticity associated with MS. Or there could be some other cause.
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