I too am sorry that you're having a tough time with painful cramps.

I take Magnesium tablets with relief, but my husband who gets frightful cramps and does not have MS, gets no relief at all from Mg. He drinks tonic water and the Quinine contained in that seems to help him. Something else you could try is to take a bath with Epson Salts added to the bath water. If you try this be careful though because the Epson Salts make the bottom of the bath very slippery.

I hope you soon find something that helps.