Unfortunately, that's not enough detail for me to give you much help except for some vague thoughts. My main concern whenever I hear about chills is an infection, specifically a systemic one. In other words, a local infection has spread to the rest of the body, or at the very least, is spreading more & more. One good but extremely worrisome example is meningitis which is an infection of the meninges or coverings of your spine & brain. A bacterial infection here could be extremely dangerous. Headache, neck stiffness & pain w/nausea are hallmarks of meningitis. I suppose you could have a headache from being dehydrated from your systemic illness such that it leads to coincidental nausea, too. Best to go see your family doc! Good luck!
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