Dear Kitty, I have a very serious suggestion for possible help, one that a neuro at Scripps gave me about 27 years ago. I could not take Baclofen or the other common drug for spasm. Serious side effects. He told me to get some form of magnesium at the drug store or health store, getting one which caused the least diarrhea. I went on 800 mg a day and my foot spasm stopped. I had already been on calcium but it wasn't working any more.

In later years my spasms have spread, and jerking (myoclonus) entered the mix. Now I must take at least 1000 mg of magnesium a day to stop spasm and jerking of my back and legs. My feet don't spasm now because the magnesium works completely for them.
I do take a couple of other things to potentiate the magnesium, but the mag is the main event.
Please do not write this off as another "health nut". It has been the ONLY help I had and it has helped a lot.