I have what seems to be nerve pain from just below my right knee that runs down front of shin to front if ankle. what could be causing this?

Tibialis anterior: It sounds like possibly you have strained your tibialis anterior muscle and tendon. This can occurr in people who do a lot of treadmill running as the tibialis anterior has to rapidly dorsiflex the foot repeatedly. Usually a overuse type of strain. Rest it and ice the dosum of the foot where the tendon inserts.Make sure you are wearing a quality running shoe.