Something very similar happened to me. I suffered two whiplash, and the second one extended to a part of my back. The first time I went to the hospital, they said well yeah just take this and this and you'll be fine in a week. So I went back to the gym a week later, thinking I was fine...
It got so worst then one night, I just couldn't move. I was paralysed by pain for the bottom to the top of my spine. I couldn't move my arms or my legs. I never, EVER, felt a pain so strong. Laying down wasn't an option, sitting either and standing up was worst.
Now because of that, my neck has become a permanent issue. It is something that will never go away. The pain comes back from time to time because of the way I sleep, or what moves I did during the day. I look creepy when I have to turn my head slooooowly because of the pain hahaha!