Called the dairy. Tarentaise and gruyere are considered "alpine cheeses" and are made similarly, and are both aged. I am now suspecting the histamine issue, which is more common in these types of cheeses. This particular tarentaise has a natural rind and is not rinsed/coated with anything.
I'll try again if they get a new block, but I"m thinking histamine. Interesting about the migraines, too, since she is my only kid to get any kind of headaches. She's had a couple I was very close to bringing her to the ER. Just the fact that I knew what it was and that some nausea meds made it better kept us home.