I was rear ended at a stoplight last week. It was a low impact collision but I was frightened to death as I have had ongoing neck problems for 1.5 years. I had a c6c7 fusion in 07 and a C5C6 fusion in 08 after a cord compressiin causing myelopathy and chronic pain. I sought medical attention in the Er, had Ct scan of head and neck which were negative.I have a nagging headache in the back of my head that feels like it is coming from my spine. Its worse the more active I am.Is this to be expected? When the insurance company asked me my diagnosis I told them whiplash which was on the Er papers. They told me that wasn't a diagnosis.How concerned should I be?