I have really hurt my foot and I don't know what it could be or what to do about it can someone help me please?

you need to be seen by a physician, who will order an X-Ray to evaluate for possible fracture, in the mean time you can place an ice pack, rest and elevate the foot while you wait to be seen. I don't understand the marked swelling without color change, but only an X-Ray can tell positively if you have a fracture. Hope this help.