I think the Achilles tendinitis is the correct initial diagnosis. Anterior pain can be caused by overstretching of the tibialis anterior, decreased posterior motion of the talus, a tight inferior syndesmotic area caused by decreased dorsiflexion. The anterior pain should resolve rapidly as has already Been alluded to as it sounds acute, or recent in nature. Athletes love to overdo it, but we have to.
If it continues, have a therapist look at it.