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It is difficult to pin point the exact cause without a clinical exam, some possibilities are there which need to be looked into like anxiety, stress, and sinusitis, cervical spine issues like disc prolapse, disc herniation or cervical spondylosis which can cause nerve compression and result in chills and headache. The possibility of migraine also cannot be ruled out.
I would suggest you to do some gentle neck exercises and in the meantime get a clinical evaluation done.