sounds like a whiplash injury to me, but i'm no expert - but have had several upper back and neck injuries with symptoms similar to what you describe. Any numbness in your arms, face, or legs? That would be the main concern - some type of cord compression. If there is numbness, I'd get it checked ASAP. Otherwise, I'd ice, take vitamin I and let it settle down. After a few days, if it is still bothering you, i'd make an appointment to see the ortho and start with some x-rays. best of luck.
"A local is just a dirtbag who can't get his shit together enough to travel."
- Owl Chapman
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