LauraM,

Welcome to NeuroTalk. I hate to sound like a broken record but that has been the protocol lately here on NT. Getting a thorough diagnostics of your upper neck is very important. This area usually gets completely overlooked. general cervical x-rays, CT Scans and MRI's often do not show problems that need more specially trained analysis.

The dynamics of your impact make an upper neck injury very suspect. The whiplash or bending of the neck can cause subtle injuries that leave prolonged symptoms. Your inner ear signals may not be making it past your upper neck / brain stem area or may be getting starved of oxygen rich blood due to inflammation.

Hope you can find specialized help.

My best to you.