foot cramps - good foot

occasionaly, i now have excruciatingly foot cramp at the big toe of my good foot, the sensation is like the muscles on my affected foot are straining and somehow pulling at those at the big toe of the good foot. the pain is around 3o seconds and it usually then disappears, after which i can feel some minor tingling of the muscles at my back. what is going on???. i take this as some sort of recovery process as the pain always goes away after a while but am perplexed as to the complexity of our muscles system which is structurally supporting our bones. what is going on????