Pain after half Ironman

Did a race Sunday and its now tuesday afternoon and I feel like i'm getting progressively sorer as time goes on.  Sunday evening was feeling pretty good just tired, woke up mon with sore popping knees and as the day progressed my neck has stiffened, shoulders tightened, and now this morning i woke up with a cramped calf as well as more intense neck pain, I was under the impression that pain and soreness would lessen as time got further from the event, not the other way around...