How can I get rid of a "Charlie horse"?!

How can I get rid of a "Charlie horse"?

I tripped and fell on my left thigh, right on top of a bunch of cards (like credit cards). The result has been a "Charlie horse", where climbing up or down the stairs is painful, to say the least.
Even bending the leg is very difficult.
Thanks for your help.

If this is a serious question, then I would recommend dorsiflexion if your 'Charlie Horse' is in your calf. That means if you get a cramp in your calf, you want to stretch the calf by bending your ankle upward as if you were trying to point your toes to your face. If you are in the process of walking and that 'Charlie Horse' happens, do the same dorsiflexion position and figure out how to keep walking like that until you can get to a couch and keep stretching that calf until the spasm subsides. It makes the muscle sore afterwards so keep that in mind.

For a thigh cramp, the quadriceps contusion type of "charley horse" is initially treated by icing. Recent studies have shown that the resulting tightness and contractures that sometimes ensue can be lessened by maintaining the knee in a fully bent position for the first 24 hours to prevent the involved muscles from going into spasm. Premature return to activity can result in calcification of the hematoma in and around the muscle, a long-term problem called myositis ossificans.