What kind of sports do you? It's important that you strenghten your back and neck muscles. Use weight lifting machines rather than free swinging weights (for stability, at least in the beginning). Go to a well renown fitness center whith a therapy section. Bear in mind that most people train mainly limbs, back and six pack, but forget the head. Do the "Schumacher"-exercises (weight lifting machines for the neck). Be patient and don't exagerate. Do it under supervision of a therapist. Visit a doctor before and if the pain doesn't stop. Do not start to train before the pains are away. Stop immediatly when they come back during training.
Dani