there is something kinda wrong with it.  I sprained my ankle about 3 days ago, nothing serious.  I was on the ground putting together a TV stand for my families new TV for christmass, and when i stood up and trying to walk it felt like my achiles was stuck at where it was when i was on the ground. 
what i mean by that is when i tryed to put my foot at a 9 degree angel it there was tightness and a degree of pain.  it was real sudden, nothing really to cause the pain, so i thought it'll go away in a couple of minutes.  3 hours later and it's still tight 
 
any clues as to whats up with it?