Very sore/stiff front thigh ....HELP!?

I worked a 14hr day on boxing day basically standing that whole time and squatting . i felt then pain half way thru the day but today morning i woke up barely able to use my front thigh muscle. like its almost impossible for me to go downstaires and hurts to go up them. and it worse to squat today. any idea how to lossen it? like i can't even walk properly! I'm willing to rub any weird herbal concoctions and stuff to so yea anything to help me will be greatly appriciated thanks!!