I Broke And Sprained Right Ankle. After 2 Months, That

I broke and sprained right ankle. After 2 months, that foot stays so cold and now the leg swells and redness creeps up the leg almost to the knee. There is still pain in the ankle when turned ce/ rtain ways and the bottom of foot feels as if I am stepping on a big cushion under the ball of the foot. What would cause this problem?