I wake up with a Charlie horse every morning. My theory is I stand weird because of the MS. I try to stretch a lot.
Keep stretching the muscles affected, and try ice on them - I hear it works well for spasticity, if that's what it is.
If it felt like a charlie horse, then it probably was a spasm. I get those in my big toe, and in both calf muscles.
I have eaten a bananna and drank lots of water today. The offending shin muscleis sore, but it is not cramping. It was like a "charly horse".
Did you injure your foot or leg in some way? 100% of the time when I hurt my foot, the calf muscle starts cramping.
Hmmm... if you're having cramping all over, that indicates something different - check with your neuro, you may be going into a flare.