as far as I am aware muscle cramps are caused by a lack of potassium.....you'll find loads of potassium in bananas/strawberries...
A few years ago, I had the most horrible cramp in my calf when I was in bed. (I got around it by stretching my leg and bringing my foot/toes up towards me) For a few days, I felt as if I had pulled a muscle and it was very sore, but I just took it easy and didn't do any sports etc for a few days until it worked it's way out....
If you're worried about, then there's no harm going to the doctor...
