Replying to Anyone who knows anything about sports medicine...

in a rugby game last night i got a really bad cramp in my calf after a long sprint but after it was streched out it was still stiff and i could walk on it and stuff. Then in the middle of the night i woke up with another super painful one where i couldnt move my leg at all. And it happened again when i was eating breakfast today then again while will sitting down doing a chem lab. The cramps are really painful ones where i can barly move my ankle.

Our trainer is stupid and says its dehydration but it cant be. anyways does anyone know otherwise?