No experience of neck injury or repair, but I can say that when I bust my elbow I tried a little bit too early to get back on the bike and crikey, did I pay for it that evening! Listen to the physioterrorist, listen to what your body is saying, and remember that even though it can be frustrating, it could be better to take a little bit longer to get back to full cycling fitness if it means you don't compromise long term healing and well-being. Heal well!