Cold and numb sensations in the brain?
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I've had migraines,... and so has a friend of mine. I had bit my cheek really badly a few days before,... and mentioned it to my friend. My friend said that the back of the cheek area was part of the same nerve signals to do with Migraines,.. that it could trigger a migraine. This was interesting as I had a mild migraine feeling the day after the cheek incident. Maybe your sinus area, cheek, or teeth are involved with this cold sensation.
Anyway, just some ramblings.