You have some muscles that have tightened up that need to be freed up to get rid of the pain. You may also still have tight muscles in your back from that incident so giving them a release may be helpful. I am thinking that is why the pain is in your neck now, that those muscles never fully released so they were able to move up into your neck to cause those pains. Releasing both your neck and back will make sure everything is taken care of and the pains won't return. Here's how to make those releases:
Put your hands alongside your head so your thumbs are on the front of the muscle under your ear and your fingers are on the back of the muscle behind your head. Squeeze your thumb and fingers together and hold. Relax your body. When your fingers and thumb touch, about two minutes, slowly lower your head as far as you can, release the pressure but hold your neck lowered for another 30 seconds.
(do from a sitting position)
Place your left hand on your left leg next to your body. Place your right hand over your left shoulder, fingers over the back and the palm in the front and firmly press on them and hold. After 30 seconds slowly lower your body forward and to the outside of your left leg, keeping your left arm fairly straight as you do. When you reach your lap remain there for another 10 seconds, release the pressure but rest there for another 30 seconds. Then reverse your hand positions and do your right side
For best results relax your body first by taking a deep breath and exhaling then remain this relaxed.