Agree with literatin on this one! I think when training for events it's easy to forget that it's not "normal" to be in pain. I know that I spent most of the 3 months leading up to my marathon with sore feet from blisters, sore muscles from hard training sessions and didn't think much about it.
I didn't get injured during the marathon, but strained my calf and hip flexor pretty soon afterwards. I think that these injuries were the result of the cumulative damage that I did to those muscles and tendons during marathon training (and because I didn't stretch properly, didn't rest when I had niggles etc).
A bit of rest will help, and getting on the bike or x-trainer is a good idea. Could you book in for a sports massage or physio session for a general check up? They could let you know which muscles are tightening and what you need to do to avoid injury there.
Good luck 