Muscle Cramp Remedies

I am currently in extreme pain. MY foot is badly cramping after a lot of exercise this week . . . i knew i didn't need to loose weight!!!! LOL I've read all comments on here and tried mustard to no avail and a hairdryer which eased my pain but only when the heat was over my foot. I'm now sat with my foot in a bowl of boiling hot water which is dulling the pain and making it slightly more bareable. Should i have been able to lay my hands on string at 1:42am i would give it a try. I am praying this is going to be a one off . . . but take comfort in knowing others sit wde awake in agony not knowing what to try next either!! At least your comments have made me smile in my hour(s) of need!!! so thank u