I get woken up at night with my leg hurting sooooooooooo bad. It kills. My muslce felels like someone is putting a knife through it. It feels like it is tightening. What can I do to stop it? Vitamins? Someone please help Me.

I get woken up at night with my leg hurting sooooooooooo bad. It kills. My muslce feels like someone is putting a knife through it. It feels like it is tightening. What can I do to stop it? Vitamins? Someone please help Me.