Foot and ankle pain that has been consistent for over 2 weeks, what could be the cause and how to treat this?

Possible sprain: If you are otherwise healthy without any history of a fall or accident, most likely you have a sprain. Watch for swelling and focal tenderness. Apply ice, rest, elevate the foot and use an ace wrap to support both the ankle and foot. Minimize weight bearing, use Motrin for pain control. An imaging study is indicated if pain persists.