I Had A Severe Pain In The Back Of My

I had a severe pain in the back of my calf. It felt like someone kicked me really hard in my calf. I couldn't walk for two days and now it still hurts but it is bearable. I have a huge bruise in my leg all the way down to my foot and around the front in my shin. What could it be? I had a doppler and it is not a blood clot.