Most people get cramp in their legs, is what you got not just a bad stitch?
If it is a stitch, think back to if you had anything to drink/eat within an hou8r or so before you set off. I have to be really strick with myself so that i dont ever touch an ounce of food or a sip or drink for 2 hours before i run or ill get a bad stitch.
I'll have to remember the try the Ibupro's for cramps, cheers for the idea WP