Could chills, palpitations, migraine aura such as shimmering lines in vision, fatigue be caused by a glutamate sensitivity?

Definitely a trigger. A variety of external and internal factors can trigger a migraine attack in certain individuals who may have a genetic or neurochemical predisposition to migraine. Here are the common suspects: cheese, alcohol (particularly red wine), chocolate, foods containing monosodium glutamate (msg), nitrates, or tyramine, and a sugar substitute.