Please help me....Pain in my leg?...please answer my question?

Something is wrong with my leg, im not sure what is wrong, the only thing i know is that i have a pain from the front of my shin to the top of my foot, it feels like a stinging sensation( last thursday i started doing kickboxing, and throughout the weekend i had that pain, and yesterday i continued but now the pain has gotten worst; when i raise my foot, is when i feel the most pain) is this normal? is this a cramp? one of my gym buddies, told me it was a nerve? what can it be?....what should i do?