How do I know if I should see a Dr. or not for neck injury?

I fell into a pool and landed somewhere on my head or neck. I don't remember which one because the blow was so different than anything I've ever felt. I didn't actually feel it when I hit the bottom, I just heard a loud shrill like noise. Like ringing in my ear. I can't move my neck at all really with out it hurting. and my throat feels weird. Should I see a Dr.? Or just give it time to heal?