I had exactly this a couple yrs ago. ice for 10mins or so, maybe longer or until it goes numb anyway, then warm it up and move it around. Try and do this up to five times a day. Gentle exercising only until it stops hurting. ie, gentle stretching and assisted heel drops. go careful on it, it can take a while. Mine was about ten days of icing it five times a day and then two or three weeks slowly getting back to normal levels of activity. If you think it’s better and go in too soon it’ll start all over again. mine did.
advice comes from this guy
http://chrisgordonsportsphysio.co.uk/about/
edit.. oh and make sure you don;t have tight calfs. get a roller on them.